This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
In mature erythrocytes the major available anion is 
Select and explain. 
A. Haemoglobin, B. Chloride, C. Bicarbonate, D. Diphosphoglycerate
B: Chloride
Answer: B: Chloride 
Explanation: In mature erythrocytes the major available anion is ClRef: Ganong&;s review of medical physiology 23rd edition Page no: 523