<prompt> DNA repair defect is seen in:Xeroderma pigmentosumLi-fraumani syndromeRetinoblastomaNone  <response>: Ans. a Xeroderma pigmentosumRef: Harpers Biochemistry, 30th ed. pg. 389-90, 28th ed.pg. 330-32 Xeroderma pigmentosum is an autosomal recessive genetic disease which arises due to defect in DNA repair particularly of thymidine dimers.Examples of Conditions Arising due to DNA Repair Defects: Xeroderma pigmentosa Ataxia telangiectasia Fanconis syndrome Bloom syndrome HNPCC 