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
If you calculate the plasma osmolality of a child with plasma Na+ 125 mEq/l, glucose 108 mg/ dl, and BUN (blood urea nitrogen) 140 mg/ dl, the most appropriate answer would be: 
Select and explain. 
A. 300 mOsm/kg, B. 306 mOsm/kg, C. 312 mOsm/kg, D. 318 mOsm/kg
B: 306 mOsm/kg
Answer: B: 306 mOsm/kg 
Explanation: B i.e. 306 mOsm/kg