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
Measure of dispersion is:(1994) 
Select and explain. 
A. Mean, B. Mode, C. Standard deviation, D. Median
C: Standard deviation
Answer: C: Standard deviation 
Explanation: Ans: cRef: Park, 17th ed, p. 612 & 18,h ed, p. 646