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': 'You are presented with a patient having a diffuse swelling in the neck bilaterally below the chin region. Intra orally the Lower molar is infected on left side\n\nWhat is the probable source of infection? \nSelect and explain. \nA. Sub maxillary space infection, B. Sub mandibular space infection, C. Sub lingual space infection, D. Sub mental space infection', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]