This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metastatic Bone Disease, Subject name: Orthopaedics
Most common site of metastases in case of osteosarcoma is 
Select and explain. 
A. Brain, B. Lungs, C. Liver, D. Bladder
B: Lungs
Answer: B: Lungs 
Explanation: Ans. is 'b' i.e., Lungs * Almost 10% of the patient have metastases at presentation. Metastases is most common to lungs, but hematogenous spread to other organs is also possible - including lymph nodes, brain and skeleton.