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 drugs should not be administered concomitantly with warfarin as it decreases the effect of oral anticoagulants ? 
Select and explain. 
A. Broad spectrum antibiotic, B. Cimetidine, C. Aspirin, D. Oral contraceptive
D: Oral contraceptive
Answer: D: Oral contraceptive 
Explanation: None