The following are multiple choice questions (with answers) about medical knowledge.   **Question:** SI unit of X-ray   (A) Rad   (B) Sv   (C) Gray   (D) Kerma
['(C) Gray <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Rad \n (B) Sv \n (C) Gray \n (D) Kerma <> possible answers', '  SI unit of X-ray <> context@']