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': 'In lake water, the highest fluoride value ever recorded in 2800 PPM. In which country this lake is situated: \nSelect and explain. \nA. Japan, B. Kenya, C. Libya, D. South Africa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]