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': 'Normal consistency of the gingiva is: \nSelect and explain. \nA. Soft, B. Hard, C. Firm, D. Firm and leathery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]