The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Water powder ratio for class IV stone is:   (A) 0.22-0.24   (B) 0.24-0.28   (C) 0.65-0.70   (D) 0.45-0.50
['(A) 0.22-0.24 <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 0.22-0.24 \n (B) 0.24-0.28 \n (C) 0.65-0.70 \n (D) 0.45-0.50 <> possible answers', '  Water powder ratio for class IV stone is: <> context@']