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': 'Standard error of mean is called as- \nSelect and explain. \nA. Standard deviation, B. Mode, C. Median, D. Variable', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Standard error is nothing else but the standard deviation of the whole population:\nFor a single sample measure of dispersion → SD\nFor whole population measure of dispersion → SE\n\n"Standard error of a statistic is the standard deviation of the sampling distribution of the statistics" \xa0— Handbook', 'role': 'assistant'}]