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': "Pott's puffy tumor: \nSelect and explain. \nA. Subperiosteal abscess of frontal bone, B. Subperiosteal abscess of ethmoid bone, C. Mucocele of frontal bone, D. Mucocele of ethmoid bone", 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer. A. Subperiosteal abscess of frontal bonePott's puffy tumor, first described by Sir Percivall Pott in 1760, is a rare clinical entity characterized by subperiosteal abscess associated with osteomyelitis. It is characterized by an osteomyelitis of the frontal bone, either direct or through haematogenous spread. This results in a swelling on the forehead, hence the name. The infection can also spread inwards, leading to an intracranial abscess. Pott's puffy tumor can be associated with coical vein thrombosis, epidural abscess, subdural empyema, and brain abscess.", 'role': 'assistant'}]