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
Which of the following is a 'Pulsating tumor' of the bone? 
Select and explain. 
A. Osteosarcoma, B. Chondrosarcoma, C. Ewing's sarcoma, D. Eosinophilic Granuloma
A: Osteosarcoma
Answer: A: Osteosarcoma 
Explanation: Telengiectatic osteosarcoma may present as a pulsatile tumor of bone. Telengiectatic osteosarcoma is an aggressive lytic form of osteosarcoma that occurs as a soft cystic tumor containing aneurysmalty dilated blood filled spaces. Ref: Paediatric and adolescent osteosarcoma by Norman Jaffe, Page 105; Annals of Surgery : Pulsating Tumors Of Bone; Pulsating, Benign Giant Cell Tumors Of Bone; Pulsating Tumors Of The Sternum; Other references.