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': 'The number of doses recommended for oral Ty21a typhoid vaccine is: \nSelect and explain. \nA. 14, B. 5, C. 3, D. 1', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The Ty21a vaccine is licensed for use in individuals > 5 years. A three dose regimen is recommended. Vaccine is administered on alternate days: 0n days 1, 3 and 5. Ref: Park 21st edition, page 215.', 'role': 'assistant'}]