This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal system, Subject name: Radiology
[{'content': '22 year old man, brought to ED by ambulance following a rugby injury.which of the following is false regarding the fracture shown? \nSelect and explain. \nA. Comminuted fracture of Tibia, B. Does not involve aicular surface, C. closed fracture, D. Posteriorly displaced fracture', 'role': 'user'}, {'content': 'Answer: C \nExplanation: This man has a comminuted fracture of the proximal diametaphysis of the tibia. It does not involve the aicular surface. The fracture is posteriorly displaced (based on the position of the distal fragment). Most impoantly, there is gas (lucency) in the soft tissues around the fracture, and also in the knee joint, indicating that this is an open fracture.', 'role': 'assistant'}]