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 one of the following drugs is not a uterine relaxant ? 
Select and explain. 
A. Isoxsuprine, B. Dopamine, C. Salbutamol, D. Terbutaline
B: Dopamine
Answer: B: Dopamine 
Explanation: None