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 is not an inotropic drug: 
Select and explain. 
A. Amrinone, B. Isoprenaline, C. Amiodarone, D. Dopamine
C: Amiodarone
Answer: C: Amiodarone 
Explanation: None