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': 'Application of incubation period is all except- \nSelect and explain. \nA. To differentiate co-primary cases from secondary cases, B. To find out time for isolation, C. To find out time for quarantine, D. To prevent infection of the contacts of the infected person', 'role': 'user'}, {'content': 'Answer: B \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 epidemiological study tracing the source of infection and contacts Period of surveillance Immunization Identifying point source or propagated epidemics Prognosis (Refer pgno:100 park 23rd edition)', 'role': 'assistant'}]