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: Surgery
The sudden appearance Dumb-bell shaped swelling during third molar nerve block is mainly due to: 
Select and explain. 
A. Injection in pterygoid plexus, B. Injection in parotid gland, C. Injection into internal maxillary artery, D. Injection into nasal cavity
C: Injection into internal maxillary artery
Answer: C: Injection into internal maxillary artery 
Explanation: None