Identify the correct statement from the following

Options

A. High levels of estrogen triggers the ovulatory surge
B. Oogonial cells start to proliferate and give rise to functional ova in regular cycles from puberty onwards
C. Sperms released from seminiferous tubules are highly motile
D. Progesterone level is high during the post ovulatory phase of menstrual cycle

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks us to identify the correct statement among the provided options regarding human reproduction.

2. **Analyzing Each Option**:
- **Option A**: "High levels of estrogen trigger the ovulatory surge."
- This statement is incorrect because it is actually the surge in luteinizing hormone (LH) that triggers ovulation, not high levels of estrogen alone.

- **Option B**: "Ogonial cells start to proliferate and give rise to functional ova in regular cycles from puberty onwards."
- This statement is also incorrect. Oogonia (not "ogonial") proliferate during fetal development, and after birth, they enter a resting phase until puberty, where they develop into primary oocytes but do not proliferate in regular cycles.

- **Option C**: "Released sperms from seminiferous tubules are highly motile."
- This statement is incorrect. Sperm are not motile immediately upon release from the seminiferous tubules; they gain motility in the epididymis and require a suitable environment (like the female reproductive tract) to swim effectively.

- **Option D**: "The level of progesterone is high during the post-ovulatory phase."
- This statement is correct. After ovulation, if pregnancy does not occur, progesterone levels will eventually decrease, but during the post-ovulatory phase, progesterone levels are indeed high to prepare the endometrium for potential implantation.

3. **Conclusion**: After analyzing all the options, we find that **Option D** is the correct statement.

**Final Answer**: The correct statement is: "The level of progesterone is high during the post-ovulatory phase."

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