The following are multiple choice questions (with answers) about medical knowledge.   **Question:** In the formula for urea clearance, C = U x V/P, U denotes:   (A) Urinary concentration in gm/24 hours   (B) Urine osmolarity   (C) Urinary concentration in mg/ml   (D) Urine volume per minute
['(C) Urinary concentration in mg/ml <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Urinary concentration in gm/24 hours \n (B) Urine osmolarity \n (C) Urinary concentration in mg/ml \n (D) Urine volume per minute <> possible answers', '  In the formula for urea clearance, C = U x V/P, U denotes: <> context@']