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
As per the most common classification of Triage system that is internationally accepted, the colour code that indicates high priority treatment or transfer is 
Select and explain. 
A. Black, B. Red, C. Yellow, D. Blue
B: Red
Answer: B: Red 
Explanation: Red - High
Yellow - Medium
Green - Low
Black - Least