<prompt> Radiotherapy is treatment of choice in :SarcoidosisTuberculosisMonoclonal hypogammaglobulinemiaSarcomas  <response>: Ans. is c monoclonal hypogammaglobulinemia Ref Harrison, 15e, p 534. I could not get the treatment for monoclonal hypogammaglobulinemia anywhere. But still the answer is obvious as radiotherapy has no role in the treatment of other disease given in the question.Treatment for: Sarcoidosis-Corticosteroids Tuberculosis-Antitubercular drugs Sarcomas-Surgery and adjuvant chemotherapy. 