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
Calcute the osmolarity of normal saline ______ 
Select and explain. 
A. 333 mOsmol / L, B. 300 mOsmol / L, C. 280 mOsmol / L, D. 320 mOsmol / L
B: 300 mOsmol / L
Answer: B: 300 mOsmol / L 
Explanation: None