This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'If a mother has had measles, her newborn baby is immune to this disease for - \nSelect and explain. \nA. 4 to 6 month, B. 6 to 12 months, C. 1 to 3 years, D. 3 to 6 years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Infants are protected from measles by maternal antibodies up to 6 months pf age. Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition pg 147', 'role': 'assistant'}]