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: Surgery
What is safe maximum time for storage of kidney? 
Select and explain. 
A. 24 hours, B. 48 hours, C. 36 hours, D. 80 hours
C: 36 hours
Answer: C: 36 hours 
Explanation: Optimal time for kidney transplant is within 18 hours. Max peroid is 36 hours.