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
[{'content': 'In osteomyelitis, solid periosteal reaction seen in the X-ray at \nSelect and explain. \nA. 1st week, B. < 2 +  hours, C. 2nd week, D. 3rd week', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]