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: ENT
[{'content': 'Middle age diabetic with tooth extraction with ipsilateral swelling over middle one-third of sternocleidomastoid & displacement of tonsils towards contralateral - \nSelect and explain. \nA. Parapharyngeal abscess, B. Retropharyngeal abscess, C. Ludwigs angina, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]