In which organ is estrogen primarily produced?

Estrogen is primarily produced in the ovaries, which are the reproductive organs in females responsible for the development and release of eggs. The ovaries are essential for the regulation of the menstrual cycle and play a crucial role in reproductive health.

In addition to the primary production in the ovaries, small amounts of estrogen can also be synthesized in other tissues, such as the adrenal glands and fat tissue, but these secondary sites do not produce estrogen at levels comparable to the ovaries.

The other options refer to organs that have different primary functions. The adrenal glands produce hormones like cortisol and adrenaline, the testes are responsible for producing testosterone and supporting sperm production in males, and the pancreas plays a critical role in digestion and blood sugar regulation by producing insulin and glucagon. Hence, these organs are not involved in the primary production of estrogen.