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
[{'content': 'The mass treatment of trachoma is undertaken if the prevalence in community is - \nSelect and explain. \nA. 3%, B. 10%, C. 5%, D. 6%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]