This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pathology
[{'content': 'Paneth cells contain \nSelect and explain. \nA. Zinc, B. Copper, C. Molybdneum, D. Selenium', 'role': 'user'}, {'content': "Answer: A \nExplanation: Paneth cells are zinc-containing cells widely distributed in Lieberkuhn's crypts of small intestine in many species, but their function has remained obscure. Our previous study showed that a single intravenous injection of diphenylthiocarbazone (dithizone), a zinc chelator, forms zinc-dithizonate complexes in the cytoplasm of Paneth cells to ensure rapid and selective killing of the cells. REFERANCE. NIH.GOV", 'role': 'assistant'}]