Pepsinogen is produced by ________ and is activated by ________, which is secreted by ________.
A. chief cells; hydrochloric acid (HCl); parietal cells
B. parietal cells; carbonic anhydrase (CAH); chief cells
C. parietal cells; hydrochloric acid (HCl); chief cells
D. chief cells; carbonic anhydrase (CAH); parietal cells
E. enteroendocrine cells; carbonic anhydrase (CAH); parietal cells
Answer: A
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