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: Medicine
Concentration of urea in a patient is 52 mg/dL. What is the serum Blood Urea Nitrogen? 
Select and explain. 
A. 24.3, B. 34.5, C. 41.9, D. 69-7
A: 24.3
Answer: A: 24.3 
Explanation: Answer- A. 24.3Serum Blood Urea Nitrogen (BUN): it is the mass of nitrogen within the urea/ unit volume.Urea= BUN * 2.14= 24.3 mg/dL