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: Anaesthesia
Visual analogue scale (VAS) most widely used to measure – 
Select and explain. 
A. Sleep, B. Sedation, C. Pain intensity, D. Depth of anaesthesia
C: Pain intensity
Answer: C: Pain intensity 
Explanation: Scales to quantify the pain :- Numerical rating scale, verbal rating scale, faces pain scale, visual analogue scale, McGill pain questionnaire, CHEOPS (in children).