Most common blood group is

Options

A. AB
B. A
C. B
D. O

Answer

**Step-by-Step Text Solution:**

1. **Understanding Blood Groups**: Blood groups are classified based on the presence or absence of specific antigens on the surface of red blood cells. The main blood group systems are ABO and Rh.

2. **ABO Blood Group System**: The ABO blood group system includes four main types: A, B, AB, and O. Each type can also be Rh-positive or Rh-negative.

3. **Prevalence of Blood Groups**: Among the ABO blood groups, the distribution varies globally. However, certain blood groups are more common in specific populations.

4. **Identifying the Most Common Blood Group**: In many populations, particularly in the United States and Europe, the most common blood group is O. This is followed by A, B, and AB, which are less common.

5. **Conclusion**: Therefore, the most common blood group is O.

**Final Answer**: The most common blood group is O.

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