Answer:
a. estradiol.
Explanation:
The granulosa cells are somatic cells, present in devoting oocyte or follicle in mammalian ovaries. These cells are primarily responsible for the production of estrogen hormone (also known as estradiol).
Estrogen is a main sex hormone that plays role in maturation of developing oocyte and ovulation, and regulates secretion of other sex hormones.
Thus, the correct answer is option (a).
