Stethoscope was invented by

Options

A. (a) Waksman
B. (b) Koch
C. (c) Laennec
D. (d) Jenner

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the inventor of the stethoscope, a medical instrument used to listen to internal sounds of a patient's body, such as heartbeats and breathing.

2. **Identifying the Inventor**: The stethoscope was invented by a doctor named René Laennec. He was a French physician practicing in Paris.

3. **Historical Context**: René Laennec invented the stethoscope in the year 1816. This was a significant advancement in medical diagnostics, allowing doctors to listen to the sounds made by the heart and lungs.

4. **Analyzing the Options**:
- Option A: Waksman - Incorrect; he is known for discovering the antibiotic neomycin.
- Option B: Koch - Incorrect; he is known for Koch's postulates in microbiology.
- Option C: Laennec - Correct; he is the inventor of the stethoscope.
- Option D: Jenner - Incorrect; he developed the first vaccine for smallpox.

5. **Conclusion**: Based on the analysis of the options, the correct answer is C, René Laennec.

**Final Answer**: The stethoscope was invented by René Laennec.

---