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
[{'content': 'Ziconotide acts by blocking ? \nSelect and explain. \nA. Voltage gated Na channel, B. Voltage gated Ca channel, C. Ligand gated Na channel, D. Ligand gated Ca channel', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b'i.e., Voltage gated Ca channel(Ref: Essential of pain medicine by HonorioBenmn p. 4581)Ziconotide:Ziconotide (SNX-111 ; Prialt) is an atypical analgesic agent for the amelioration of severe and chronic pain.Acts as a selective N-type voltage-gated calcium channel blocker.", 'role': 'assistant'}]