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
[{'content': 'MC cause of common cold/ coryza is: \nSelect and explain. \nA. Influenza virus, B. Respiratory Synctial virus, C. Adenovirus, D. Enterovirus 70', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]