The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A researcher is testing an unknown compound, X, and seeing the effect it has on renal function. When she applies compound X to the cells, she finds that the urinary concentration of sodium and the pH decreases while the urinary potassium increases. Which of the following correctly states: 1) the cells of the kidney this compound acts on and 2) the identity of compound X?   (A) Distal convoluted tubule; atrial natriuretic peptide   (B) Distal convoluted tubule; hydrochlorothiazide   (C) Principal cells; aldosterone   (D) Principal cells; spironolactone
['(C) Principal cells; aldosterone <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Distal convoluted tubule; atrial natriuretic peptide \n (B) Distal convoluted tubule; hydrochlorothiazide \n (C) Principal cells; aldosterone \n (D) Principal cells; spironolactone <> possible answers', '  A researcher is testing an unknown compound, X, and seeing the effect it has on renal function. When she applies compound X to the cells, she finds that the urinary concentration of sodium and the pH decreases while the urinary potassium increases. Which of the following correctly states:\n1) the cells of the kidney this compound acts on and\n2) the identity of compound X? <> context@']