This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Channelopathies and Neuropathies, Subject name: Medicine
[{'content': "1st symptom to respond to IV Thiamine in Wernicke's encephalopathy is? \nSelect and explain. \nA. Opthalmoplegia, B. Sensory Ataxia, C. Vestibular ataxia, D. Global confusion", 'role': 'user'}, {'content': "Answer: A \nExplanation: Wernicke's encephalopathy * Global Confusion * Ophthalmoplegia: VI N. * Ataxia - Rx- IV Thiamine -First to respond to treatment - Ophthalmoplegia", 'role': 'assistant'}]