This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': '12 years old presents with fever, unilateral post auricular pain, mastoid bulging and displacing the pinna forward outwards with loss of bony trabeculae. This patient has a history of chronic persistent pus discharge from the same ear. Treatment of choice is \nSelect and explain. \nA. Antibiotics only, B. Incision and drainage, C. Antibiotics and incision and drainage, D. Mastoidectomy with incision and drainage and antibiotics', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The patient is presenting with features of the postauricular subperiosteal abscess. Treatment for this is antibiotics along with drainage of the abscess and coical mastoidectomyThe patients have developed this abscess as a complication of CSOM (History of chronic ear discharge) for which he requires mastoidectomyRef: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 86 - 87', 'role': 'assistant'}]