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: Medicine
[{'content': 'Carrier stage is not seen in - \nSelect and explain. \nA. Diphtheria, B. Typhoid, C. Hepatitis - B, D. Whooping cough', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]