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: Medicine
[{'content': 'A young girl has consumed barium carbonate with suicidal intent. She complains of generalized muscle weakness. The most likely electrolyte is - \nSelect and explain. \nA. Hyponatremia, B. Hypocalcemia, C. Hypokalemia, D. Hypomagnesemia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]