Pneumonia commonly affects which part of the body?

Pneumonia commonly affects the lungs, which is the correct answer. Pneumonia is an inflammatory condition of the lung, often caused by infections from bacteria, viruses, or fungi. It results in the air sacs within the lungs filling with fluid or pus, leading to symptoms such as cough, fever, chest pain, and difficulty breathing. The condition can vary in severity, ranging from mild to life-threatening, particularly in vulnerable populations such as the very young, the elderly, or those with underlying health issues.

Because pneumonia is specifically a lung condition, the other options—brain, heart, and skin—are not relevant. While infections can affect these areas, they do not pertain to pneumonia.