The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Due to which of the following enzyme deficiency, vitamin C cannot be synthesised in humans?   (A) L-Glucuronic acid oxidase   (B) L-Gulonic acid reductase   (C) L-Gulonolactone oxidase   (D) L-Gulonolactone reductase
['(C) L-Gulonolactone oxidase <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) L-Glucuronic acid oxidase \n (B) L-Gulonic acid reductase \n (C) L-Gulonolactone oxidase \n (D) L-Gulonolactone reductase <> possible answers', '  Due to which of the following enzyme deficiency, vitamin C cannot be synthesised in humans? <> context@']