Question

Choose the mismatched pair:

• A. Leydig cells -- Testosterone
• B. Corpus luteum -- Progesterone
• C. Pancreas -- Glucagon
• D. Pineal gland -- Calcitonin

Hint:

Pineal gland $\rightarrow$ Melatonin Thyroid gland $\rightarrow$ Calcitonin Corpus luteum $\rightarrow$ Progesterone Leydig cells $\rightarrow$ Testosterone

Answer 1

The Correct Option is D

Concept: Every endocrine gland secretes specific hormones. To identify a mismatched pair, each gland-hormone combination must be verified.

Step 1: Check Leydig cells -- Testosterone. Leydig cells are present in testes. They secrete: \[ \boxed{\text{Testosterone}} \] Hence this pair is correct.

Step 2: Check Corpus luteum -- Progesterone. Corpus luteum develops after ovulation. It secretes: \[ \boxed{\text{Progesterone}} \] Hence this pair is correct.

Step 3: Check Pancreas -- Glucagon. Alpha cells of pancreas secrete: \[ \boxed{\text{Glucagon}} \] Therefore this pair is correct.

Step 4: Check Pineal gland -- Calcitonin. Pineal gland secretes: \[ \boxed{\text{Melatonin}} \] Calcitonin is secreted by: \[ \boxed{\text{Thyroid gland}} \] Therefore this pair is incorrect.

Step 5: Identify the mismatched pair. \[ \boxed{\text{Pineal gland -- Calcitonin}} \] Hence, \[ \boxed{\text{Option (D)}} \]