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
Osmolarity of plasma is 
Select and explain. 
A. 190, B. 290, C. 390, D. 490
B: 290
Answer: B: 290 
Explanation: 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