This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pharmacology
[{'content': 'Calcium carbonate is used for \nSelect and explain. \nA. Antacid, B. Renal stone, C. Metabolic alkalosis, D. Renal failure', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref: Katzung's, 14th ed. pg. 1089* This medication is used to treat symptoms caused by too much stomach acid such as heartburn, upset stomach, or indigestion.* It is an antacid that works by lowering the amount of acid in the stomach.* It can also be used in renal osteodystrophy with hyperphosphatemia, hypocalcemia and osteoporosis like conditions.* It can cause metabolic alkalosis (Milk-alkali syndrome)", 'role': 'assistant'}]