<prompt> Least likely to be Pre-leukemic condition is ?Paroxysmal nocturnal hemoglobinuriaParoxysmal cold hemoglobinuriaAplastic anemiaMyelodysplastc syndrome  <response>: Ans. is b i.e., Paroxysmal cold hemoglobinuria Conditions predisposing to acute leukemia o Myelodysplastic syndrome o Chronic myeloproliferative disorders o Ionizing radiation ceain toxic chemicals o Bloom syndrome o Fanconi anemia o Paroxysmal nocturnal hemoglobinuria o Li-Fraumani syndrome o Diamond - Blackfan anemia o Ataxia telangiectasia Down syndrome Klinefelters syndrome o Neurofibromatosis o Aplastic anemia rarely Schwachman syndrome Turner syndrome 