Which of the following is a typical symptom of pneumonia?

Pneumonia typically presents with symptoms that affect the respiratory system, and a cough coupled with difficulty breathing is a hallmark of this condition. When the lungs become inflamed due to infection—caused by bacteria, viruses, or fungi—the body's response includes the production of mucus, which can lead to a persistent cough. Additionally, as the air sacs in the lungs fill with fluid or pus, it becomes harder for oxygen to be exchanged, resulting in difficulty in breathing.

The other symptoms listed, such as weight gain, severe headache, and skin rash, do not directly correlate with pneumonia. Weight gain generally is not associated with this respiratory infection, while severe headaches can occur with a variety of conditions but are not characteristic of pneumonia. A skin rash might indicate other issues, such as an allergic reaction or other infections, but is not a typical symptom of pneumonia. Hence, the correct answer regarding the typical symptoms of pneumonia is indeed the presence of cough and difficulty breathing.