This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, 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: d-tubocurarine :- - is a competitive NM blocker. It produces fall in BP due to:- - causes Blockade of sympathetic ganglia. - causes Histamine release. - Reduced venous return as a result of paralysis of limb and respiratory muscles.