Sister Chromatid Exchanges Increase in Frequency in the Presence of X-Rays,certain

Multiple Choice

Sister chromatid exchanges increase in frequency in the presence of X-rays,certain viruses,ultraviolet light,and certain chemical mutagens.In what autosomal recessive disorder is there known to be an increase in sister chromatid exchanges?

A) cystic fibrosis
B) Harlequin syndrome
C) achondroplasia
D) Huntington's disease
E) Bloom syndrome