Assertion : Estrogen level is high during the follicular phase of menstrual cycle .
Reason : During this phase corpus luteum secrete large amount of estrogen .

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

### Step-by-Step Text Solution:

1. **Understanding the Assertion**: The assertion states that "Estrogen level is high during the follicular phase of the menstrual cycle." This is true because during the follicular phase, which lasts from day 6 to day 13 of the menstrual cycle, developing follicles secrete estrogen.

2. **Understanding the Reason**: The reason provided is "During this phase, corpus luteum secretes a large amount of estrogen." This statement is false. The corpus luteum is formed after ovulation, which occurs around day 14 of the cycle. Therefore, during the follicular phase, the corpus luteum is not present, and it does not secrete estrogen.

3. **Conclusion**: Since the assertion is true (estrogen levels are high during the follicular phase due to the developing follicles), but the reason is false (the corpus luteum does not secrete estrogen during this phase), we conclude that the assertion is true and the reason is false.

4. **Final Answer**: The correct option is that the assertion is true, but the reason is false.