**Core Concept**
The normal menstrual cycle is a complex physiological process controlled by the hypothalamic-pituitary-ovarian axis, involving the coordinated interaction of hormones and the regulation of follicular growth, ovulation, and menstruation.

**Why the Correct Answer is Right**
The correct answer is related to the follicular phase of the menstrual cycle, which is characterized by the growth and maturation of follicles in the ovaries. The dominant follicle secretes estrogen, which promotes endometrial proliferation and thickening. The peak level of estrogen triggers a surge in luteinizing hormone (LH) secretion, leading to ovulation. The LH surge is the key event that marks the transition from the follicular to the luteal phase. The correct answer is likely to be related to this LH surge.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe a key event in the menstrual cycle. The follicular phase is characterized by follicular growth and estrogen secretion, but it does not involve the LH surge that marks the transition to the luteal phase.

**Option B:** This option is incorrect because it is not a specific event in the menstrual cycle. While the follicular phase is a critical component of the menstrual cycle, option B does not provide any specific information about the cycle.

**Option C:** This option is incorrect because it is a characteristic of the luteal phase, not the follicular phase. The luteal phase is marked by the production of progesterone by the corpus luteum, which prepares the endometrium for implantation.

**Option D:** This option is incorrect because it is a characteristic of the menstrual phase, not the follicular phase. The menstrual phase is marked by the shedding of the endometrium, which occurs when progesterone levels drop.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the LH surge is the trigger for ovulation, and it marks the transition from the follicular to the luteal phase. This is a critical concept in reproductive endocrinology and is essential for understanding the menstrual cycle.

**Correct Answer:** C.