Salvarsan is arsenic containing drug which was first used for the treatment of.________.

Options

A. syphilis
B. typhoid
C. meningitis
D. dysentry

Answer

**Step-by-Step Solution:**

1. **Identify the Drug**: The drug in question is Salvarsan, which is known to contain arsenic.

2. **Historical Context**: Salvarsan was one of the first synthetic drugs developed for medical use. It was introduced in the early 20th century.

3. **Determine the Disease Treated**: Salvarsan was primarily used for the treatment of syphilis, a sexually transmitted infection.

4. **Understand the Causative Agent**: The bacterium responsible for syphilis is Treponema pallidum. It is important to note that this bacterium is transmitted through sexual contact.

5. **Conclusion**: Therefore, the answer to the question is that Salvarsan was first used for the treatment of syphilis.

**Final Answer**: Salvarsan is an arsenic-containing drug which was first used for the treatment of **syphilis**.

---