This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluids and Electrolyte Imbalance, Subject name: Medicine
[{'content': 'Patient develops vomiting episodes and extreme muscle weakness. Cause is? \nSelect and explain. \nA. Hypokalemia, B. Hyponatremia, C. Hypophosphatemia, D. Hypomagnesemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vomiting - Dehydration - Low GFR - stimulate RAAS mechanism- | Aldosterone | (Hypokalemic Alkalosis) Hypokalemia- Muscle weakness (Diaphragmatic paralysis) Hyponatremia - Seizures Hypomagnesemia - Tetany', 'role': 'assistant'}]