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': 'Incubation period knowledge helps in all of the following except: September 2007 \nSelect and explain. \nA. Isolation, B. Quarantine, C. Detecting source of infection, D. Vaccination', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Isolation Quarantine applies to those who have been exposed to a contagious disease but who may or may not become ill. Isolation applies to persons who are known to be ill with a contagious disease. Epidemiological impoance of knowledge of incubation period: Tracing the source of infection and contacts Period of surveillance/quarantine Immunization Identification of point source or propagated epidemics Prognosis', 'role': 'assistant'}]