This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thigh, Knee,Leg,Foot & Ankle injuries, Subject name: Orthopaedics
[{'content': 'A 42-year-old man is brought to the trauma center after fall from ladder. Physical exam shows a slightly deformed left lower extremity with a 0.5cms soft tissue defect over the anterolateral aspect of his leg. The wound appears relatively clean with no gross contaminants present. Radiographs depict a sho oblique proximal one-third diaphyseal tibia fracture. What is his Gustilo open fracture classification grade \nSelect and explain. \nA. I, B. II, C. IIIa, D. IIIb', 'role': 'user'}, {'content': 'Answer: A \nExplanation: This is a Gustilo and Anderson type I fracture. There is a simple fracture pattern in the setting of clean, <1-cm wound. <img alt="" src=" />', 'role': 'assistant'}]