This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
MC cause of common cold/ coryza is: 
Select and explain. 
A. Influenza virus, B. Respiratory Synctial virus, C. Adenovirus, D. Enterovirus 70
C: Adenovirus
Answer: C: Adenovirus 
Explanation: COMMON COLD (CORYZA) Aetiology: Caused by a virus. The infection is usually contracted through airborne droplets. Several viruses (adenovirus, picornavirus & its subgroups such as rhinovirus, coxsackie virus & enteric cytopathic human orphan virus) are responsible. Incubation period is 1-4 days & illness lasts for 2-3 weeks.