The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 65-year-old male is treated for anal carcinoma with therapy including external beam radiation. How does radiation affect cancer cells?   (A) Induces the formation of thymidine dimers   (B) Induces the formation of disulfide bonds   (C) Induces deamination of cytosine   (D) Induces breaks in double-stranded DNA
['(D) Induces breaks in double-stranded DNA <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Induces the formation of thymidine dimers \n (B) Induces the formation of disulfide bonds \n (C) Induces deamination of cytosine \n (D) Induces breaks in double-stranded DNA <> possible answers', '  A 65-year-old male is treated for anal carcinoma with therapy including external beam radiation. How does radiation affect cancer cells? <> context@']