This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Large intestine, Subject name: Surgery
[{'content': "The most common facial abnormality in Gardener's syndrome: \nSelect and explain. \nA. Ectodermal dysplasia, B. Odontome, C. Multiple osteomas, D. Dental cysts", 'role': 'user'}, {'content': "Answer: C \nExplanation: GARDNER'S SYNDROME (AD) Skeletal abnormalities, the most common of which are osteomas, are an essential component of Gardner syndrome. The osteomas are characterized by slow, continuous growth, and occur most frequently in the mandible, the outer coex of the skull and the paranasal sinuses. The angle of the mandible is a paicularly diagnostic site.", 'role': 'assistant'}]