If the centromere is located at the proximity of the end of a chromosome, it is known as

The correct option is Acrocentric.

Chromosomes are classified into four main types based on the position of the centromere (the region that joins the two sister chromatids):

1. Telocentric: The centromere is located at the very terminal end of the chromosome, so there is only one arm visible.

2. Acrocentric: The centromere is located close or near to one end (at the proximity of the end), resulting in one extremely short arm (p-arm) and one very long arm (q-arm).

3. Submetacentric: The centromere is located slightly away from the middle point, leading to one slightly shorter arm and one longer arm.

4. Metacentric: The centromere is located in the middle, dividing the chromosome into two arms of approximately equal length.

Therefore, when the centromere is positioned at the proximity of the end of a chromosome, it is classified as an acrocentric chromosome.