The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Klenow fragment lacks the activity of?   (A) 3'-5' exonuclease   (B) 5'-3' exonuclease   (C) 5'-3' DNA polymerase   (D) 3'-5' DNA polymerase
["(B) 5'-3' exonuclease <> answer", 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', "(A) 3'-5' exonuclease \n (B) 5'-3' exonuclease \n (C) 5'-3' DNA polymerase \n (D) 3'-5' DNA polymerase <> possible answers", '  Klenow fragment lacks the activity of? <> context@']