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': 'Complete denture patients have a preference for which region when the consistency of food is tough \nSelect and explain. \nA. 2nd molar region, B. Premolar region, C. 1st molar region, D. Premolar and molar region', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]