Arsenic drugs are mainly used in the treatment of :

Options

A. Jaundice
B. Typhoid
C. Syphilis
D. Cholera.

Answer

To solve the question regarding the primary use of arsenic drugs, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Arsenic Drugs**:
- Arsenic drugs are a class of medications that contain arsenic as a key component. They have been historically used in the treatment of various diseases.

2. **Identifying the Options**:
- The options provided are:
- A) Jaundice
- B) Typhoid
- C) Syphilis
- D) Cholera

3. **Researching the Uses of Arsenic Drugs**:
- Arsenic drugs are particularly known for their effectiveness against certain bacterial infections. One of the most notable uses is in the treatment of syphilis.

4. **Specific Drug Example**:
- An example of an arsenic drug is Arsphenamine, commonly known as Salvarsan. This drug was specifically developed for the treatment of syphilis.

5. **Mechanism of Action**:
- Arsenic drugs are more toxic to the bacteria that cause syphilis (specifically, the Spirochete bacterium) than to human cells. This selective toxicity makes them effective in treating the disease.

6. **Evaluating the Options**:
- Based on the information gathered:
- Jaundice: Not treated with arsenic drugs.
- Typhoid: Not treated with arsenic drugs.
- Syphilis: Treated with arsenic drugs (correct answer).
- Cholera: Not treated with arsenic drugs.

7. **Conclusion**:
- The correct answer is C) Syphilis.

### Final Answer:
The arsenic drugs are mainly used in the treatment of **C) Syphilis**.