Biology

The correct answer is: B.Centromere.

The centromere is the region of the chromosome where the sister chromatids are held together prior to anaphase. During cell division, the centromere acts as the attachment point for the spindle fibers and plays a key role in ensuring proper chromosome separation during mitosis.

Here's what the other terms refer to:

A.Centriole: A structure involved in organizing the microtubules of the spindle apparatus, but not directly responsible for holding sister chromatids together.

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