Question

gender variation in endocrine glands
the secretions from which of these glands differ between males and females?
parathyroid
adrenal
gonadal
pancreas

Explanation:

Gonadal glands (testes in males and ovaries in females) secrete different hormones (testosterone in males, estrogen and progesterone in females). Parathyroid regulates calcium, adrenal has cortisol/aldosterone (similar in both), pancreas has insulin/glucagon (similar in both).

Answer:

Gonadal