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 has least effect on cardiovascular system - 
Select and explain. 
A. Gallamine, B. Pancuronium, C. Tubocurarine, D. Atracurium
D: Atracurium
Answer: D: Atracurium 
Explanation: Ans. is 'd' i.e., Atracurium o Atracurium has no effect on cardiovascular system, so it can be used in patients with altered hemodynamics.