In a "typical" `28` day female reproductive cycle, on which day fallowing the beginning of the menstrual period is the level of luteinizing harmone most likely to be highest?

Options

A. day `5`
B. day `7`
C. day `14`
D. day `21`

Answer

To determine the day on which the level of luteinizing hormone (LH) is highest in a typical 28-day female reproductive cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Phases of the Menstrual Cycle**:
- The menstrual cycle is divided into four main phases:
- Menstrual Phase (Days 1-5)
- Follicular Phase (Days 6-13)
- Ovulatory Phase (Day 14)
- Luteal Phase (Days 15-28)

2. **Identify the Role of Luteinizing Hormone (LH)**:
- LH is produced by the anterior pituitary gland and plays a crucial role in triggering ovulation.

3. **Locate the Ovulation Day**:
- Ovulation typically occurs around Day 14 of the menstrual cycle. This is when the LH levels peak.

4. **Determine the Highest LH Level**:
- Since ovulation is triggered by a surge in LH, the highest level of LH is expected to be on the day of ovulation, which is Day 14.

5. **Conclusion**:
- Therefore, the day following the beginning of the menstrual period on which the level of luteinizing hormone is most likely to be highest is **Day 14**.

### Final Answer:
- The level of luteinizing hormone is most likely to be highest on **Day 14** of the menstrual cycle.

---