Answer: Modified Bases, Single-stranded breaks and double-stranded breaks
Explanation:
Modified Bases are the type of lesions which a xeroderma pigmentosum patient suffers thus causing changes to the bases themselves, such as the methylation of guanine to O6MeG, which base-pairs with thymine, or the UV-induced creation of thymine dimers.
Single Stranded Breaks : deals in a nick in the sugar-phosphate backbone of one strand. This is caused by peroxides, Cu++ ion, oxygen radicals, or ionizing radiation.
Double stranded Breaks: this is where both strand backbones are broken. This is typically caused by ionizing radiation. this is the most lethal of all