This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck Infections, Subject name: ENT
[{'content': "Ludwig's angina is - \nSelect and explain. \nA. Unstable angina, B. Prizmetal's angina, C. Infection of submandibular space, D. Infection of retropharyngeal space", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Infection of submandibular space o Caldwell-Luc operation is a process of opening the maxillary antrum through canine fossa by sublabial approach and dealing with the pathology inside the antrum.o In this surgery, antrum is reached through a incision in gingivolabial sulcus (from lateral incisor to 2nd molar) and then opening of antrum in this area.o During the surgery a noso-antral window is made through the inferior meatus so that after the surgery, packing of sinus can be removed through this window.", 'role': 'assistant'}]