This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Plastic & Reconstructive Surgery, Subject name: Surgery
[{'content': 'Potts puffy tumor occurs as complication of which sinusitis: \nSelect and explain. \nA. Frontal, B. Sphenoid, C. Ethmoid, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Frontal* Pott Puffy Tumor occurs if infection of frontal sinusitis spreads to the marrow of the frontal bone, causing localized osteomyelitis with bone destruction that can result in a doughy swelling of the forehead.* Surgical drainage and debridement must be undertaken.', 'role': 'assistant'}]