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
[{'content': 'Which is the colour of highest priority in emergency triage: \nSelect and explain. \nA. Red, B. Yellow, C. Black, D. White', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) RedRef : K. Park 23rd ed. / 795-97', 'role': 'assistant'}]