This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': "Age group affected by Hepatitis 'A' virus - \nSelect and explain. \nA. Children, B. Adult, C. Old age, D. Any age", 'role': 'user'}, {'content': 'Answer: A \nExplanation: HAV affecting mainly children REF:<\\p> ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.541', 'role': 'assistant'}]