This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
[{'content': 'Angiotensin-conveing enzymes are \nSelect and explain. \nA. Zinc containing and cleaves C-terminal of AT-1, B. Zinc containing enzyme and cleaves the signal poion of AT-!, C. Copper containing and cleaves C-terminal of AT-!, D. Copper containing enzyme and cleaves the signal poion of AT-1', 'role': 'user'}, {'content': "Answer: A \nExplanation: The structure of the somatic form of angiotensin-conveing enzyme has sho cytoplasmic tail of the molecule and the two extracellular catalytic sites, each of which binds a zinc ion (Zn2+). Angiotensin-conveing enzyme (ACE) is a dipeptidyl carboxypeptidase that splits off histidyl-leucine(at C-terminal of AT1) from the physiologically inactive angiotensin I, forming the octapeptide angiotensin II. Ref: Ganong's Review of Medical Physiology, 23rd edition, page no: 670, 672 Ref of image:", 'role': 'assistant'}]