This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and Health, Subject name: Social & Preventive Medicine
Which is the colour of highest priority in emergency triage: 
Select and explain. 
A. Red, B. Yellow, C. Black, D. White
A: Red
Answer: A: Red 
Explanation: Ans. (a) RedRef : K. Park 23rd ed. / 795-97