This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Measures of Central Tendency and Distribution, Subject name: Social & Preventive Medicine
[{'content': 'For 95% confidence limits true is : \nSelect and explain. \nA. 1.95 of standard error of mean, B. Reduces 95% of values, C. 2.95 of standard error of mean, D. Normal distribution+-2.5 S.D.', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e.1.95 of standard error of mean [Ref: Park 20/e, p 751 (18/e, p647, 17/e p613, 16/e, p 595)Jx +/- 1 - (area b/w 1 S.D on either = 68% confidence limits side of mean)x +/- 2 - (S.D.) =95.4%x +/- 3 - (S.D.) =97.7%", 'role': 'assistant'}]