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
Pearson's Coefficient of skewness is defined as: 
Select and explain. 
A. (Mean-Mode) / SD, B. (Median-Mode) / SD, C. SD / (Mean - Mode), D. SD / (Median -Mode)
A: (Mean-Mode) / SD
Answer: A: (Mean-Mode) / SD 
Explanation: The coefficient used for checking the skewness of data, is called as the Karl Pearson coefficient, and is calculated as (Mean - Mode) S.D. Ref: Instant Medical Biostatistics, By Ranjan Das, Papri N. Das, 2009 Ane's Instant Medical Series, Page 41, 42.