Whats the type of O - type blood

The type that O blood has is the O type?

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O-type blood is considered the universal blood type because it carries the antibodies for both A and B blood, making O blood ideal for tranfusions.

If you have type O blood, ketsueki-gata suggests that you are confident, self-determined, strong-willed and intuitive; unfortunately, you are also self-centered, cold, unpredictable and potentially a workaholic.