This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Incubation period helps in determining all except- \nSelect and explain. \nA. Period of isolation, B. Period of quarantine, C. Identification of source of infection, D. Immunization', 'role': 'user'}, {'content': "Answer: A \nExplanation: An infection becomes apparent only after a ceain incubation period which is defined as the time interval between invasion by an epidemiological agent and the appearance of first sign or symptoms. During the incubation period, the infectious agent undergoes multiplication in the host Incubation period is of fundamental impoance in an epidemiological study tracing the source of infection and contacts Period of surveillance Immunization Identifying point source or propagated epidemics Prognosis (Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 107, 108)", 'role': 'assistant'}]