Person with AB/O blood group is called universal recipient.

Explanation

To determine whether a person with AB or O blood group is called a universal recipient, we need to analyze the characteristics of each blood group in relation to the presence of antigens and antibodies.

### Step-by-Step Solution:

1. **Understanding Blood Groups**:
- There are four main blood groups in the ABO system: A, B, AB, and O.
- Each blood group is defined by the presence or absence of specific surface antigens on red blood cells (RBCs).

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