This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
In the treatment of severe bradycardia, all of the following can be the best modality of treatment except- 
Select and explain. 
A. Atropine, B. Pacing, C. Isoproterenol, D. Diltiazem
D: Diltiazem
Answer: D: Diltiazem 
Explanation: atropine,pacing,isoproterenol can be used to increase hea rate in bradycardia diltiazem is a calcium channel blocker used to reduce hea rate Ref Harrison 20th edition pg 1456