Which hormone from the anterior pituitary stimulates ovulation and testosterone production?

• A. FSH
• B. LH
• C. ACTH
• D. TSH

Answer: (B)

Luteinizing hormone from the anterior pituitary is the signal that triggers ovulation and also drives testosterone production. In the female, the LH surge at mid-cycle causes the mature follicle to release the egg and supports formation of the corpus luteum, which secretes progesterone. In the male, LH acts on Leydig cells in the testes to stimulate the enzymatic steps that produce testosterone, which is essential for spermatogenesis and male characteristics. The other hormones listed have different primary roles: FSH mainly promotes follicle growth and spermatogenesis, ACTH stimulates adrenal cortisol production, and TSH stimulates thyroid hormone release.