This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Osmolarity of plasma is \nSelect and explain. \nA. 190, B. 290, C. 390, D. 490', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Plasma Osmolarity :it is a measure of hydration status.plasma Osmolarity changes during dehydration and rehydration. Plasma Osmolarity ranges from 280 to 300 mOs/kg Ref:Guyton and Hall textbook of medical physiology 12th edition ,pag number:45 46', 'role': 'assistant'}]