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: Radiology
Half life f-18 is: 
Select and explain. 
A. 110 min, B. 90 min, C. 6 hours, D. 13 days
A: 110 min
Answer: A: 110 min 
Explanation: Ans. 110 min