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': 'Square root of detion is called as \nSelect and explain. \nA. Standard detion, B. Standard error, C. Mean detion, D. Range', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The standard detion Most frequently used measure of detion Widely used measure of variability or diversity used in statistics and probability theory Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition - Pgno. 848', 'role': 'assistant'}]