This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'Not a measure of central tendency- \nSelect and explain. \nA. Mean, B. SD, C. Mode, D. Median', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., SD * The commonly used statistical average (measures of central tendency) are (i) Arithmetic mean, (ii) Median and (iii) Mode.", 'role': 'assistant'}]