Q: From which part of the female reproductive system is estrogen produced?  

Answer: C

Estrogen is a female sex hormone that plays an important role in the development and maintenance of female reproductive system and secondary sex characteristics. It is mainly produced by the ovarian follicles, which are small sacs within the ovaries that contain the immature eggs. During each menstrual cycle, a follicle grows and develops under the influence of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) produced by the pituitary gland. As the follicle matures, it produces increasing amounts of estrogen until it reaches a peak level, which triggers ovulation. After ovulation, the remaining cells of the follicle form a structure called the corpus luteum, which produces both estrogen and progesterone. However, estrogen is primarily produced by the follicles.

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