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
Drug of choice for maintenance therapy in PSVT is 
Select and explain. 
A. Amiodarone, B. Lingnocaine, C. Verapamil, D. Adenosine
C: Verapamil
Answer: C: Verapamil 
Explanation: Table 276-3 Verapamil 5-10 mg ,over 3-5 min , maintenance: 2.5-10 mg/h ,SVT, AF rate control Ref Davidson 20th edition pg 1532