Select the incorrect statement.

Options

A. LH and FSH triggers ovulation in ovary
B. LH and FSH decrease gradually during the follicular phase
C. LH triggers secretion of androgens from the Leydig cells
D. FSH stimulates the Sertoli cells which help in spermatogenesis

Answer

To solve the question of selecting the incorrect statement regarding LH (luteinizing hormone) and FSH (follicle-stimulating hormone), we can analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement A**: "LH and FSH trigger ovulation in the ovary."
- **Analysis**: This statement is true. LH and FSH are crucial for the process of ovulation in females.

- **Statement B**: "LH and FSH decrease gradually during the follicular phase."
- **Analysis**: This statement is incorrect. During the follicular phase, LH and FSH levels actually rise to stimulate the growth of ovarian follicles. A decrease during this phase would be contradictory to their function.

- **Statement C**: "LH triggers secretion of androgen from Leydig cells."
- **Analysis**: This statement is true. LH stimulates Leydig cells in males to produce testosterone, which is an androgen.

- **Statement D**: "FSH stimulates the Sertoli cells which help in spermatogenesis."
- **Analysis**: This statement is also true. FSH plays a significant role in stimulating Sertoli cells, which are essential for the process of spermatogenesis in males.

2. **Conclusion**:
- The only incorrect statement among the given options is **Statement B**: "LH and FSH decrease gradually during the follicular phase."

### Final Answer:
**The incorrect statement is Statement B: "LH and FSH decrease gradually during the follicular phase."**

---