This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Normal urea excretion rate is? 
Select and explain. 
A. 1-2 gm per day, B. 10-20 gm/day, C. 20-40 gm per day, D. 50-100 gm/day
B: 10-20 gm/day
Answer: B: 10-20 gm/day 
Explanation: Ans. is 'b' i.e., 10-20 gm/day(Ref: Medical physiology E Book 2d/e p. 767)"The physiologically normal individual excrete 12-20 gm of urea nitrogen in 24 hours"