This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck, Subject name: Pathology
Olliers disease also known as? 
Select and explain. 
A. Osteosarcoma, B. Enchondromatosis, C. Multiple myeloma, D. Enchondrosis
B: Enchondromatosis
Answer: B: Enchondromatosis 
Explanation: Ans. (b) Enchondromatosis(Ref: Robbins 9th/pg)Ollier disease is a rare, non inherited disease of unknown cause characterized by multiple enchondromas.