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
The most impoant factor that influences the outcome of penetrating cardiac injuries is 
Select and explain. 
A. Comminuted tear of a single chamber, B. Multiple-chamber injuries, C. Coronary aery injury, D. Tangential injuries
C: Coronary aery injury
Answer: C: Coronary aery injury 
Explanation: 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