Which of the following is not a sexually-transmitted disease?
A. Gonorhoea
B. Syphilis
D. Typhoid

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Hint: Infections or diseases can be infected or acquired by various methods such as through contamination of food, through contagious infection, through transmission through physical methods and through unsafe sexual methods. The diseases or infections that are spread or acquired through sexual contact are known as sexually-transmitted disease.

Complete answer:
Gonorrhea has been caused by an infection of both male and female sexually transmitted bacterium (Neisseria gonorrhoeae). Gonorrhea is the infection which mostly affects the urethra, rectum, or throat. It can also affect the cervix in females. The infection from gonorrhea is most frequently transmitted by unsafe and unhygienic vaginal, oral or anal intercourse.
Syphilis is a bacterial infection commonly acquired by sexual contact. The disease begins as a painless sore-usually on your vagina, rectum, or mouth. Syphilis mostly spreads from infected person to other person via contact with these sores through the skin or mucous membrane. It is caused by the infection of a bacterium, Treponema pallidum. The final stage of the infection may cause damage to the brain, nerves, and eyes as well as to the heart.
Acquired immunodeficiency syndrome (AIDS) is a chronic disease in humans. It is caused by the virus named as human immunodeficiency virus (HIV), which is potentially life threatening. HIV interferes with the body's ability to combat infection and sickness by weakening your immune system. People most usually get or transmit HIV by sexual activities and use needles or syringes.
The bacteria Salmonella typhi is the causative agent of typhoid fever. It is rare in countries of industrialization. In the developing world, however, it remains a serious health threat, particularly to children. The fever or the infection spreads through contaminated food and water, or even through close contact with an infected person. Symptoms and indications usually include high fever, fatigue, stomach pain and either constipation or diarrhea.
An infection of bacteria, which can lead to high fever, diarrhea or vomiting doesn’t come under the category of sexually transmitted diseases (STDs). It could be lethal. It is more prevalent in areas where hand washing is less common.

Hence, The correct answer is option (D).

Note: The bacteria that cause typhoid fever spread through contaminated food or water and often by direct contact with an infected person. In developing countries where typhoid fever is most threatening, most cases result from drinking of polluted water and maintaining poor sanitation. The main symptoms of this fever includes high fever, headache with the presence of severe abdominal pain and presence of either constipation or diarrhea.