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: Dental
[{'content': 'Colombo plan is a plan of: \nSelect and explain. \nA. UNO, B. World Bank, C. Common Wealth countries, D. Government of Ceylon', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]