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': 'When observations are made before and after the exposure to the factor, it is \nSelect and explain. \nA. Chi-square test, B. Unpaired T-test, C. Paired T-test, D. Paired T-test', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Paired T-test o Paired T - test : is applied to paired data when each individual gives a pair of observation, such as when observations are made both before and after the play of a factor. e.g. Pulse rate before and after administration of a drug.", 'role': 'assistant'}]