In the figure below, O is the center of the circle. Name a diameter of the circle.

The diameter of circle O in the image given is: AB.
The diameter of a circle can be referred to as the largest chord in a circle which is the line segment that passes through the center of a circle with both ends on the circle.
In the image given, AB is the largest chord and also passes through the center of the circle, O.
Thus, the diameter is: AB.
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