This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'The most impoant factor that influences the outcome of penetrating cardiac injuries is \nSelect and explain. \nA. Comminuted tear of a single chamber, B. Multiple-chamber injuries, C. Coronary aery injury, D. Tangential injuries', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Multiple studies in the literature confirm that injuries to the coronary aeries are the most impoant factor in determining outcome after a penetrating cardiac injury. Tangential injuries are the least serious. Injury to a single chamber--even if comminuted--or to multiple chambers is less likely to be fatal than are injuries that involve a major coronary aery. ref - Harrisons 20th ed', 'role': 'assistant'}]