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
Standard deviation is a measure of - 
Select and explain. 
A. Chance, B. Deviation from mean value, C. Central tendency, D. None of the above
B: Deviation from mean value
Answer: B: Deviation from mean value 
Explanation: None