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': 'Ludwigs angina usually begins in ? \nSelect and explain. \nA. Submandibular space, B. Sublingual space, C. Parotid space, D. Retropharyngeal space', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Submandibular space Ludwig's angina is a rapidly spreading bilateral cellulitis that involves the floor of mouth, under the tongue. Floor of mouth is comprised of sublingual space, submandibular space and submental space. Ludwig's angina usually begins in the submandibular space, and then rapidly spreads to involve the subligual space, usually on a bilateral basis. Most common cause is infection of the root of the teeth (Dental infection), especially 2nd and 3nd mandibular molar. Other causes are mouth injury, mandibular fracture, and submandibular sialadenitis.", 'role': 'assistant'}]