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 three Landmarks which determine skeletal convexity\nare: \nSelect and explain. \nA. Glabella, prosthion and supramentale, B. Nasion, sella and articulare, C. Nasion, subspinale and pogonion, D. Orbitale, anterior nasal spine and pogonion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]