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': 'if each value of a given group of observation is multiplied by 10, the standard detion of the resulting observation is - \nSelect and explain. \nA. Original std. Detion x 10, B. Original std. Detion/10, C. Original std. Detion -10, D. Original std. Detion itself', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Original standard detion X 10", 'role': 'assistant'}]