TB is caused by bacteria :

Question

Accepted Answer

TB, or tuberculosis, is a serious infectious disease that primarily affects the lungs, although it can also impact other parts of the body. The disease is caused by a specific type of bacteria known as Mycobacterium tuberculosis. This bacterium is highly specialized and has evolved to survive and multiply within the human body, particularly in the lungs, where it causes the characteristic symptoms of TB, such as a persistent cough, fever, night sweats, and weight loss.

**Explanation for Option 2: Mycobacterium tuberculosis**

Mycobacterium tuberculosis is the correct answer because it is the specific bacterium responsible for causing tuberculosis. This bacterium is part of the Mycobacterium genus, which is known for its slow growth and unique cell wall structure that makes it resistant to many common antibiotics. The identification of Mycobacterium tuberculosis as the causative agent of TB dates back to 1882 when Dr. Robert Koch first discovered it, which was a significant milestone in medical microbiology. The bacterium is transmitted from person to person through airborne particles, typically when an infected person coughs or sneezes.

**Explanation for why other options are incorrect:**

1. **Corynebacterium tuberculosis**: This is not a valid scientific name for any known bacterium. The genus Corynebacterium includes different species, such as Corynebacterium diphtheriae, which causes diphtheria, but none are associated with tuberculosis. Therefore, this option is incorrect.

3. **Bordetella pertussis**: This bacterium is known for causing whooping cough, a highly contagious respiratory disease. It is not related to tuberculosis and does not belong to the Mycobacterium genus. Hence, this option is incorrect.

4. **Clostridium tuberculosis**: Similar to the first option, this is not a valid scientific name. The genus Clostridium includes bacteria such as Clostridium botulinum and Clostridium tetani, which cause botulism and tetanus, respectively. None of the Clostridium species are responsible for tuberculosis, making this option incorrect.

In conclusion, Mycobacterium tuberculosis is the only bacterium among the given options that causes tuberculosis, which is why Option 2 is the correct answer.