Question

What is the source of progesterone:
A. Corpus luteum
B. Ovary
C. Ovarian follicle
D. Uterus

Answer 1

Hint: The progesterone is a steroid hormone and is mainly required at the time of the menstrual cycle. The level of progesterone varies highly in the menstrual cycle, that is if the egg is not fertilized then the corpus luteum degenerates and the level of progesterone will decline.

Complete answer: The progesterone hormone helps in maintaining the inner lining (also called the endometrium) of the uterus.
Since these structures are associated with the menstrual cycle so we will look into further details about them.
At the time of the menstrual cycle, the egg is released from the ovary on day 14, and the remnants of an ovarian follicle that have enclosed the ova or egg that is released from the corpus luteum.
Now, the egg has been released in the fallopian duct and with the help of progesterone secreted by the corpus luteum, the egg prepares for the fertilization.

So, the option A. Corpus luteum is the correct option.

Note: The corpus luteum is formed by the remnants of the ovarian follicles so it is not a single ovarian follicle that produces the progesterone rather it is accumulative of an ovarian follicle that is corpus luteum that produces progesterone.