This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Wounds, Tissue Repair & Scars, Subject name: Surgery
[{'content': 'In metabolic alkalosis, there is which of the following? \nSelect and explain. \nA. Gain in fixed acid, B. Loss of base, C. Hyperkalemia, D. Rise in base excess', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In metabolic alkalosis, there may be a loss of fixed acids or excess of base. It is associated with hypokalemia because of renal conservation of H+ ions and urinary potassium loss. Loss of hydrochloric acid as seen in vomiting in patients with pyloric obstruction results in hypochloremic, hypokalemic, metabolic alkalosis.', 'role': 'assistant'}]