Which symptom is common to the flu, the common cold, and strep throat?

symptoms of flu

Severe aches in your muscles and joints. Weakness or severe fatigue. Warm, flushed skin and red, watery eyes.

common cold

runny or stuffy nose, Sore throat, Cough , Congestion, Slight body aches or a mild headache, Sneezing, Low-grade fever.

strep throat

Sore throat that can start very quickly, Pain when swallowing, Fever

Red and swollen tonsils, Tiny, red spots on the roof of the mouth

answer; /// i believe that the correct answer is (c) the concentration of active ingredients in a medication