This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Anatomy
[{'content': 'All of the following are seen in persisting vomitting EXCEPT \nSelect and explain. \nA. Hypokalemia, B. Decreased K+ in urine, C. Elevated pH of blood, D. Metabolic alkalosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Presistant vomitting causes loss of hydrochloric acid, K+ Na+ ions and body fluids. Loss of HCl leads to metabolic alkalosis. Loss of K+ leads to hypokalemia which fuher increases the pH of blood (intracellular K+ ions come out in the ECF by exchanging with H+ ions of ECF). Hypokalemia should lead to decreased K+ in urine but this does not happen - Low Na+ and hypovolemia would lead to increased aldosterone secretion which would increase the reabsorption of Na+ ions in the distal renal tubular in exchange of K+ ions. Thus K+ ions excretion in urine is increased despite hypokalemia.', 'role': 'assistant'}]