Which Indian scientist gave extensive information about Pheretima by printing a memoir ?

Options

A. Birbal Sahni
B. Beni Prasad
C. Karam Narain Bahl
D. Har Gobind Khorana

Answer

To answer the question "Which Indian scientist gave extensive information about Pheretima by printing a memoir?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Subject Matter**: The question is about an Indian scientist who studied Pheretima, which is a genus of earthworms.

2. **Research Historical Contributions**: Look into the contributions of Indian scientists in the field of biology, specifically those who focused on earthworms.

3. **Recognize Key Figures**: One prominent Indian scientist known for his work on earthworms is **Dr. A. S. Rao**. He published a memoir that provided extensive information about Pheretima.

4. **Conclude the Answer**: Based on the research, the answer to the question is that **Dr. A. S. Rao** is the Indian scientist who gave extensive information about Pheretima by printing a memoir.

### Final Answer:
Dr. A. S. Rao is the Indian scientist who provided extensive information about Pheretima by printing a memoir.

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