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
Pain rating index is provided by 
Select and explain. 
A. Faces scale, B. Visual analogue scale, C. Mc Gill questionniare, D. CHEOP scale
C: Mc Gill questionniare
Answer: C: Mc Gill questionniare 
Explanation: C i.e. Mc Gill questionnaire