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
Patient undergoing surgery was given a muscle relaxant. It produced marked fall in B.P. and increase in airway resistance which were reversed with diphenhydramine. The muscle relaxant was most probably : 
Select and explain. 
A. Atracurium, B. Diazepam, C. Tubocurarine, D. Vecuronium
C: Tubocurarine
Answer: C: Tubocurarine 
Explanation: None