Assertion : After fertilization corpus luteum is stable till parturition .
Reason : After 3 months of intrauterine life it dominantly secretes progesterone .

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False .
D. If both Assertion & Reason are False.

Answer

To solve the assertion and reason question, we will analyze both statements separately and determine their validity.

### Step 1: Analyze the Assertion
**Assertion:** After fertilization, the corpus luteum is stable till parturition.

- The corpus luteum is formed from the remnants of the Graafian follicle after ovulation.
- It acts as a temporary endocrine gland that secretes progesterone.
- Progesterone is crucial for maintaining the endometrium, which supports the implantation of the fertilized egg (blastocyst).
- The corpus luteum remains functional and stable throughout pregnancy until parturition (childbirth).

**Conclusion for Assertion:** This statement is **True**.

### Step 2: Analyze the Reason
**Reason:** After 3 months of intrauterine life, it dominantly secretes progesterone.

- The statement refers to "intrauterine life," which begins after fertilization and implantation.
- While the corpus luteum does secrete progesterone, it is important to note that after approximately 10-12 weeks of pregnancy, the placenta takes over the role of progesterone secretion.
- Therefore, the assertion that the corpus luteum continues to be the dominant source of progesterone after 3 months is incorrect.

**Conclusion for Reason:** This statement is **False**.

### Step 3: Determine the Relationship
- The assertion is true, while the reason is false.
- Therefore, the correct answer is that the assertion is true, but the reason is false.

### Final Answer:
The assertion is true, and the reason is false.

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