input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Treatment of choice in a patient with a staghorn calculus with mild hydronephrosis?   (A) ESWL   (B) PCNL   (C) RIRS   (D) Open surgery
output: ['(B) PCNL <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) ESWL  (B) PCNL  (C) RIRS  (D) Open surgery <> possible answers', '  Treatment of choice in a patient with a staghorn calculus with mild hydronephrosis? <> context']