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: Orthopaedics
Diaphyseal aclasis is 
Select and explain. 
A. Multiple enchondromatosis, B. Multiple hemagioma, C. Multiple osteoid osteoma, D. Multiple exostosis
D: Multiple exostosis
Answer: D: Multiple exostosis 
Explanation: Hereditary multiple osteochondromas (HMO) also known as Hereditary multiple exostoses is a disorder characterized by the development of multiple benign
osteocartilaginous masses (exostoses) in relation to the ends of long bones of the lower limbs such as the femurs and tibias and of the upper limbs such as the humeri