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': 'Square root of deviation is also called as - \nSelect and explain. \nA. Standard deviation, B. Standard error, C. Mean deviation, D. Range', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]