Answer :
The most common infectious disease is a common cold which is a viral infection that is characterized by varying symptoms like stuffy nose to coughing and a fever. This disease basically attacks the mucous membranes of the nose and throat but can attack the entire respiratory system. Usually this is a self limited disease.
The right answer is D. the common cold.
The cold is caused by a virus. It is a frequent infection of the nose and throat also called viral or acute rhinitis.
The cold is responsible for sneezing, nasal congestion (feeling of a stuffy nose), a runny nose that requires a nose and often a sore throat.
Its symptoms appear gradually and persist for 5 to 7 days, rarely more.