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: Social & Preventive Medicine
[{'content': 'Latent infection occurs in the following except \nSelect and explain. \nA. Mumps, B. Herpes simplex, C. Brill-zinsser disease, D. Ancylostomiasis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Mumps", 'role': 'assistant'}]