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
Blood supply of premolars comes from: 
Select and explain. 
A. Same source as that of molars, B. Same source as that of anteriors, C. Posterior superior alveolar artery, D. Both 1 and 3
D: Both 1 and 3
Answer: D: Both 1 and 3 
Explanation: None