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
Which of the following inhibits theophylline metabolism ? 
Select and explain. 
A. Griseofulvin, B. Prednisolone, C. INH, D. Ciprofloxacin
D: Ciprofloxacin
Answer: D: Ciprofloxacin 
Explanation: None