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
[{'content': '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: \nSelect and explain. \nA. 300 mOsm/kg, B. 306 mOsm/kg, C. 312 mOsm/kg, D. 318 mOsm/kg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. 306 mOsm/kg', 'role': 'assistant'}]