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': "The mechanism of action of valproic acid is \nSelect and explain. \nA. Inhibition of Na+ channel inactivation, B. Inhibition of GABA, C. Opening of K+ channels, D. Inhibition of 'T' type Ca+2 current", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]