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: Anaesthesia
Anaesthetic agent mainly excreted by kidneys is : 
Select and explain. 
A. d-Tubocurarine, B. Scoline, C. Halothane, D. Gallamine
D: Gallamine
Answer: D: Gallamine 
Explanation: Gallamine