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': 'All of the following diseases can be transmitted during the incubation period except \nSelect and explain. \nA. Tuberculosis, B. Measles, C. Hepatitis A, D. Pertussis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: • Carrier: An infected person or animal that harbours a specific infectious agent ‘in the absence of discernible clinical disease’ and serves as a potential source of infection to others.\n• Incubatory carriers: Shed infectious agent during the incubation period of the disease (esp. during last few days of IP).\nFor example: Measles, Mumps, Polio, Pertussis, Influenza, Diphtheria, Hepatitis B, HIV.', 'role': 'assistant'}]