Q: Why is blood grouping important?  

Answer: B

Blood grouping is the classification of blood based on the presence or absence of certain antigens on the surface of red blood cells. The most commonly used system for blood grouping is the ABO system, which categorizes blood into four types: A, B, AB, and O. The Rh factor is another important factor used in blood grouping. Blood transfusion is the process of transferring blood or blood products from one person to another. It is crucial that the blood type of the donor and the recipient match to prevent adverse reactions, which can be life-threatening. Hence, blood grouping is important for blood transfusion to ensure that the recipient receives compatible blood.

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