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: Pharmacology
[{'content': 'Colour of teeth stained by tetracycline appear _______  under UV light \nSelect and explain. \nA. Red, B. Green, C. Yellow, D. Brown', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]