This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Variables, Scales, Subject name: Social & Preventive Medicine
True about Visual analog Scale 
Select and explain. 
A. Type of scale used for ABO Blood group, B. Used for Measurement of Pain, C. Also known as Like scale, D. Used for only two variables data
B: Used for Measurement of Pain
Answer: B: Used for Measurement of Pain 
Explanation: Visual Analog Scale: Used for Measurement of Pain 10 cms (0-100 mm) long plastic scale Used when pt is illiterate, in ICU, under anesthesia, pediatric pts.