This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious disease, Subject name: Pediatrics
[{'content': 'Viral gastroenteritis may be caused by all of the following in infant and young children except \nSelect and explain. \nA. Enterovirus, B. Coronavirus, C. Calcivirus, D. Adenovirus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Coronavirus may cause enteritis or colitis in neonates and infants. Calcivirus is best known for causing large, explosive diarrhea outbreaks among older children and adults. Enteric adenovirus are a common cause of viral gastroenteritis in infants and children causing mild to moderate watery winter diarrhea. Reference: Nelson textbook of pediatrics 19th edition Page 1134 & 1135', 'role': 'assistant'}]