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
[{'content': 'The sudden appearance Dumb-bell shaped swelling during third molar nerve block is mainly due to: \nSelect and explain. \nA. Injection in pterygoid plexus, B. Injection in parotid gland, C. Injection into internal maxillary artery, D. Injection into nasal cavity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]