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: Pharmacology
All are true about digoxin except: 
Select and explain. 
A. Causes bradycardia due to increased vagal tone, B. Acts by inhibiting Na+K+ ATPase in myocardial fibres, C. It is 95% plasma protein bound, D. Primarily excreted unchanged by glomerular filtration
C: It is 95% plasma protein bound
Answer: C: It is 95% plasma protein bound 
Explanation: Ans. (C) It is 95% plasma protein bound(Ref: KDT 8th/e p559)Plasma protein binding of digitoxin is high (95%) whereas it is low (70-80%) for digoxin.