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
The fall in blood pressure caused by d–tubocurarine is due to : 
Select and explain. 
A. Reduced venous return, B. Ganglionic blockade, C. Histamine release, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None