The answer is B.
Chronic myelogenous cancer, also known as Chronic myelogenous leukemia (CML) is associated with an abnormal chromosome called the Philadelphia chromosome.
Most cases of CML start when a "swapping" of chromosomal material (DNA) occurs between chromosome 9 and 22 during cell division. Part of chromosome 9 goes to 22 and part of chromosome 22 goes to 9.
This is called a translocation and gives rise to a chromosome 22 that is shorter than normal. This new abnormal chromosome is called the Philadelphia chromosome and it is found in the leukemia cells of almost all patients with CML.
