Column I
I. Proliferative phase
II. Leydig's cell
III. Spermiogenesis
IV. Secretory phase
Column II
(A) Testosterone
(B) Estrogen
(C) Progesterone
(D) Spermatid

Options

A. I - B, II - A, III - D, IV - C
B. I - D, II - B, III - C, IV - A
C. I - D, II - C, III - B, IV - A
D. I - D, II - C, III - A, IV - B

Answer

To solve the matching question between Column I and Column II, we will analyze each item in Column I and find the corresponding match in Column II.

### Step-by-Step Solution:

1. **Identify the Proliferative Phase:**
- The proliferative phase is part of the female menstrual cycle, occurring from day 6 to day 13. During this phase, the follicles develop, and the hormone primarily secreted is estrogen.
- **Match:** I. Proliferative phase → (B) Estrogen

2. **Identify Leydig's Cell:**
- Leydig cells are located in the testes and are responsible for producing testosterone, which is a key male hormone.
- **Match:** II. Leydig's cell → (A) Testosterone

3. **Identify Spermiogenesis:**
- Spermiogenesis is the process where spermatids mature into sperm. The spermatids are the immature form of sperm.
- **Match:** III. Spermiogenesis → (D) Spermatid

4. **Identify the Secretory Phase:**
- The secretory phase follows ovulation and is characterized by the secretion of progesterone from the corpus luteum.
- **Match:** IV. Secretory phase → (C) Progesterone

### Final Matches:
- I. Proliferative phase → (B) Estrogen
- II. Leydig's cell → (A) Testosterone
- III. Spermiogenesis → (D) Spermatid
- IV. Secretory phase → (C) Progesterone

### Summary of Matches:
- I - B
- II - A
- III - D
- IV - C