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: Pharmacology
The chief advantage of ketorolac over aspirin is that the former : 
Select and explain. 
A. Can be combined more safely with an opioid such as codeine., B. Does not prolong bleeding time., C. Is available in a parenteral formulation that can be used intramuscularly or intravenously., D. Is less likely to cause acute renal failure in patients with pre-existing renal impairment.
C: Is available in a parenteral formulation that can be used intramuscularly or intravenously.
Answer: C: Is available in a parenteral formulation that can be used intramuscularly or intravenously. 
Explanation: None