¿Cuál de las siguientes bacterias es anaerobia? a. Clostridium botulinum. b. Mycobacterium tuberculosis. c. Legionella pneumophila. d. Haemophilu...

The correct answer is a. Clostridium botulinum.

Here's why:

• Clostridium botulinum is a strictly anaerobic bacterium, meaning it cannot survive in the presence of oxygen. It is responsible for botulism, a serious illness caused by a toxin produced by the bacterium.
• Mycobacterium tuberculosis is a facultative anaerobe, meaning it can grow in both aerobic and anaerobic conditions. It is the bacterium that causes tuberculosis.
• Legionella pneumophila is an aerobic bacterium, meaning it requires oxygen to grow. It is the bacterium that causes Legionnaires' disease, a type of pneumonia.
• Haemophilus influenzae type B is also an aerobic bacterium. It is the bacterium that causes a variety of childhood illnesses, including meningitis, epiglottitis, and pneumonia.

Therefore, among the listed options, only Clostridium botulinum is an anaerobic bacterium.