The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A patient presented with pain in the right lower quadrant of abdomen. He has history of renal stones in right kidney. He was prescribed an opioid which is agonist at kappa receptors and antagonist at mu receptors. The likely drug given was:   (A) Pentazocine   (B) Buprenorphine   (C) Tramadol   (D) Fentanyl
['(A) Pentazocine <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Pentazocine \n (B) Buprenorphine \n (C) Tramadol \n (D) Fentanyl <> possible answers', '  A patient presented with pain in the right lower quadrant of abdomen. He has history of renal stones in right kidney. He was prescribed an opioid which is agonist at kappa receptors and antagonist at mu receptors. The likely drug given was: <> context@']