Hint: Bacterial diseases are caused by harmful strain of bacteria. They reproduce quickly inside the body. It releases certain toxins which make us ill and can damage tissues.
To solve this question, we must know about the causative agents of the diseases given in the question.
A)Tetanus and mumps- Tetanus is a serious bacterial disease which affects the nervous system. Mumps is a viral infection which causes swelling of the salivary gland. (Option A is incorrect).
B)Herpes and influenza- Herpes is caused by a Simplex virus which causes blisters around the mouth and genitals. Influenza is a kind of flu caused by influenza virus. (Option B incorrect)
C)Cholera and tetanus- Cholera is a bacterial disease which is caused by Vibrio cholera. It causes watery diarrhoea like symptoms. Tetanus is a serious bacterial disease which affects the nervous system.(option C correct)
D)Typhoid and smallpox-Typhoid is caused by bacteria Salmonella typhi. Smallpox was an infectious viral disease caused by variola. (option D incorrect)
Hence, the correct answer is option (C)
Note: Smallpox was a contagious and highly infectious disease which is now declared as eradicated globally in 1980. There is no treatment or cure for smallpox. It can only be prevented by the administration of vaccines. Naturally occurring smallpox infection has been eradicated by immunisation.