Which of the following can lead to menstruation in a 21 year old woman during ovulation ?
A.Sperms available for fertilisation B.Oviducts blocked C.Sperms not avilable for fertilisation D.Oviducts nor blocked

Options

A. A and B
B. B and C
C. A and C
D. B and D

Answer

To determine which of the options can lead to menstruation in a 21-year-old woman during ovulation, we need to understand the process of menstruation and the role of ovulation and fertilization.

### Step-by-Step Solution:

1. **Understanding Menstruation**: Menstruation is the shedding of the endometrial lining of the uterus when there is no fertilization of the egg. It typically occurs about 14 days after ovulation if the egg is not fertilized.

2. **Understanding Ovulation**: Ovulation is the process where an ovum (egg) is released from the ovary. This usually occurs around the middle of the menstrual cycle.

3. **Analyzing the Options**:
- **A. Sperms available for fertilization**: If sperm is available and fertilization occurs, the endometrial lining is maintained to support a potential pregnancy. Therefore, this option does not lead to menstruation.
- **B. Oviducts blocked**: If the oviducts (fallopian tubes) are blocked, the sperm cannot reach the egg for fertilization. If fertilization does not happen, menstruation will occur as the body sheds the endometrial lining.
- **C. Sperms not available for fertilization**: If there are no sperm available, fertilization cannot occur. This also leads to menstruation as the endometrial lining is shed.
- **D. Oviducts not blocked**: If the oviducts are not blocked, fertilization can occur if sperm is present. This would prevent menstruation as the lining is maintained for a potential pregnancy.

4. **Conclusion**: The options that can lead to menstruation are:
- **B. Oviducts blocked**
- **C. Sperms not available for fertilization**

### Final Answer:
The correct options are **B and C**.

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