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': 'Disease higly transmitted during incubation period is -a)  Pertussisb)  Cholerac)  Measlesd)  Brucellosise)  Chickenpox \nSelect and explain. \nA. cb, B. bad, C. ace, D. da', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]