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': 'The correlation coefficient can range from: \nSelect and explain. \nA. 0 to + 1, B. 0 to -1, C. -1 to +1., D. 0 to 100', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]