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': 'Masticator space infection usually results from: \nSelect and explain. \nA. Infections of the last two lower molar, B. Non aseptic technique in local anaesthesia, C. External or internal trauma to the mandibular angle region, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]