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': 'Mesial slope of distobuccal cusp of maxillary first\nmolar meets its distal slope at ______________ angle \nSelect and explain. \nA. Acute angle, B. No specific angle, C. Obtuse angle, D. Right angle', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]