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: Forensic Medicine
[{'content': 'Extensive abrasions are found on the body of a pedestrian. The cause is: AI 09 \nSelect and explain. \nA. Primary impact injury, B. Secondary impact injury, C. Secondary injury, D. Postmoem aifact', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Secondary injury', 'role': 'assistant'}]