Match List-I with List-II.

	List-I		List-II
A.	Progesterone	I.	Pars intermedia
B.	Relaxin	II.	Ovary
C.	Melanocyte stimulating hormone	III.	Adrenal Medulla
D.	Catecholamines	IV.	Corpus luteum

Choose the correct answer from the options given below :

To match each hormone in List‑I with the structure that primarily secretes it, we consider the well‑known source of each hormone:

1. Progesterone – This steroid hormone is produced in large amounts by the corpus luteum after ovulation. Therefore, Progesterone corresponds to option IV.

2. Relaxin – Relaxin is secreted by the ovary (especially by the corpus luteum and placental tissues) during pregnancy. Hence, Relaxin matches option II.

3. Melanocyte‑stimulating hormone (MSH) – MSH is synthesized in the pars intermedia of the pituitary gland. This gives the pair MSH – pars intermedia, i.e., option I.

4. Catecholamines – The catecholamines (epinephrine, norepinephrine) are produced by the adrenal medulla. Thus, catecholamines correspond to option III.

Putting the matches together gives the final pairing:

A‑IV, B‑II, C‑I, D‑III.