<prompt> Ataxia telangiectasia is chracterised by all of the following except :Chronic sinopulmonary diseaseDecreased level of a-fetoproteinChromosomal breakageIgA deficiency  <response>: Answer is B Decreased levels of a fetoproteins Persistance of very high levels of oncofetal proteins, including alpha fetoproteins and carcinoembryonic antigens is of diagnostic value - Harrison All other features mentioned as options are characteristics of Ataxia-telengiectasia 