The antituberculosis drug is

Options

A. Terramycin
B. Neomycin
C. Streptomycin
D. Chloromycin

Answer

### Step-by-Step Solution:

1. **Identify the Disease**: The question refers to an antituberculosis drug, which is used to treat tuberculosis (TB). Tuberculosis is a serious infectious disease that primarily affects the lungs but can also affect other parts of the body.

2. **Understand the Causative Agent**: Tuberculosis is caused by a bacterium known as *Mycobacterium tuberculosis*. This bacterium is responsible for the infection and needs to be targeted by the appropriate medication.

3. **Know the Treatment**: To treat bacterial infections like tuberculosis, antibiotics are used. Antibiotics are substances that can kill or inhibit the growth of bacteria.

4. **Identify the Specific Antibiotic**: One of the key antibiotics used to treat tuberculosis is **Streptomycin**. It is effective against *Mycobacterium tuberculosis* and is produced by the bacterium *Streptomyces griseus*.

5. **Conclusion**: Therefore, the antituberculosis drug is **Streptomycin**.