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: Pathology
[{'content': 'A child is diagnosed with osteosarcoma based on Sunray appearance seen on X ray.\nThis is because of \nSelect and explain. \nA. Periosteal reaction, B. Calcification along the blood vessels, C. Calcification along the periosteum, D. Soft tissue invasion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]