No menstruation cycle occurs
A. Before puberty
B. After 50 years
C. During lactation
D. Bet. puberty and menopause

Options

A. A, B
B. A, B, C
C. C, D
D. A, B, C, D

Answer

To solve the question "No menstruation cycle occurs", we need to analyze each option provided:

### Step-by-Step Solution:

1. **Understanding Menstruation Cycle**: The menstruation cycle is a regular process that occurs in females during their reproductive years, typically starting after puberty and continuing until menopause.

2. **Analyzing Option A: Before Puberty**:
- Before puberty, the body has not developed the necessary hormonal changes to initiate menstruation. Therefore, no menstruation cycle occurs before puberty.
- **Conclusion**: This option is correct.

3. **Analyzing Option B: After 50 Years**:
- After the age of 50, women typically experience menopause, which marks the end of their reproductive years. During menopause, menstruation ceases.
- **Conclusion**: This option is also correct.

4. **Analyzing Option C: During Lactation**:
- During lactation, the body produces hormones that can suppress ovulation and menstruation. While menstruation may not occur regularly during this time, it can resume for some women after a certain period.
- **Conclusion**: This option is correct as menstruation can temporarily cease during lactation.

5. **Analyzing Option D: Between Puberty and Menopause**:
- This period is known as the reproductive age, where menstruation cycles occur regularly. Therefore, menstruation does occur during this time.
- **Conclusion**: This option is incorrect.

### Final Answer:
Based on the analysis, the correct options where no menstruation cycle occurs are:
- A. Before puberty
- B. After 50 years
- C. During lactation

Thus, the answer is **A, B, and C**.