Choice A rationale:

Rash on the skin is not a common symptom of influenza. Influenza primarily affects the respiratory system and does not typically cause skin rashes.

Choice B rationale:

Diarrhea is not a typical symptom of influenza. While some gastrointestinal symptoms may occur in some cases, they are not characteristic of influenza.

Choice C rationale:

This is a correct choice. Muscle aches (myalgia) are commonly associated with influenza. Many people with influenza experience muscle pain and soreness.

Choice D rationale:

Increased appetite is not a common symptom of influenza. In fact, loss of appetite is more common during an influenza infection.

Choice E rationale:

This is a correct choice. Dry cough is a common symptom of influenza. Influenza can cause irritation in the respiratory tract, leading to a dry cough.