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': 'Blood supply of premolars comes from: \nSelect and explain. \nA. Same source as that of molars, B. Same source as that of anteriors, C. Posterior superior alveolar artery, D. Both 1 and 3', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]