Who discovered that RNA is genetic material in TMV ?

Options

A. Gierere and Schramm
B. Issacs and Lindemann
C. Sinsheimer
D. Delbruck.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks who discovered that RNA is the genetic material in Tobacco Mosaic Virus (TMV).

2. **Identifying Key Information**: TMV is a well-known plant virus that primarily affects tobacco and other plants. It is important to note that TMV contains RNA as its genetic material.

3. **Historical Context**: The discovery that RNA serves as the genetic material in TMV is significant in virology and molecular biology.

4. **Identifying the Discoverers**: According to the video transcript, the individuals credited with this discovery are Guerrere and Sackman.

5. **Conclusion**: Therefore, the correct answer to the question is Guerrere and Sackman.

**Final Answer**: Guerrere and Sackman discovered that RNA is the genetic material in Tobacco Mosaic Virus (TMV).

---