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': 'Kaplan meier methods is used for - \nSelect and explain. \nA. Survival, B. Prevalance, C. Incidence, D. Frequency', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Survival o The Kaplan-Meier estimator (also known as the product limit estimator) estimates the survival function from life-time data. In medical research, it might be used to measure the fraction of patients living for a ceain amount of time after treatment. o A plot of the Kaplan-Meier estimate of the survival function is a series of horizontal steps of declining magnitude which, when a large enough sample is taken, approaches the true survival function for that population. The value of the survival function between successive distinct sampled observations is assumed to be constant. o An impoant advantages of the Kaplan-Meier curve is that the method can take into account "censored" data ? losses from the sample before the final outcome is observed (for instance, if a patient withdraws from a study).', 'role': 'assistant'}]