Definition: You are given a question on virology. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: The rotavirus is an important cause of which of the following?
(A)Respiratory infection in adults (B)Gastroenteritis in children (C)Diarrhoea and vomiting in adults (D)Cancer

B