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
The most common facial abnormality in Gardener's syndrome: 
Select and explain. 
A. Ectodermal dysplasia, B. Odontome, C. Multiple osteomas, D. Dental cysts
C: Multiple osteomas
Answer: C: Multiple osteomas 
Explanation: 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.