Select the correctly matched pair.

Options

A. Melatgnin - Hastens puberty
B. Progesterone — Stimulates follicle maturation
C. FSH — Surge causes ovulation
D. LH — Stimulates testosterone synthesis in males

Answer

To solve the question of selecting the correctly matched pair from the given options, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Analyze Option A: Melatonin which hastens puberty**
- Melatonin is a hormone that regulates sleep-wake cycles and is known to influence reproductive hormones. However, it actually delays the onset of puberty rather than hastening it.
- **Conclusion:** This option is incorrect.

2. **Analyze Option B: Progesterone stimulates follicular maturation**
- Progesterone is primarily involved in preparing the uterus for potential pregnancy after ovulation. It does not stimulate follicular maturation; that role is primarily fulfilled by estrogen.
- **Conclusion:** This option is incorrect.

3. **Analyze Option C: FSH surge causes ovulation**
- Follicle Stimulating Hormone (FSH) is important for the growth and maturation of ovarian follicles, but it is the surge of Luteinizing Hormone (LH) that triggers ovulation, not FSH.
- **Conclusion:** This option is incorrect.

4. **Analyze Option D: LH stimulates testosterone synthesis in males**
- Luteinizing Hormone (LH) plays a crucial role in the male reproductive system by stimulating the Leydig cells in the testes to produce testosterone. This is a correct statement.
- **Conclusion:** This option is correct.

### Final Answer:
The correctly matched pair is **Option D: LH stimulates testosterone synthesis in males.**

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