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: Pathology
[{'content': "When osmotic fragility is normal, RBC's begin to hemolyse when suspended in saline ? \nSelect and explain. \nA. 0.33%, B. 0.48%, C. 0.90%, D. 1.20%", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 0.48%", 'role': 'assistant'}]