<prompt> A child presents with seborrheic dermatitis, sinusitis and chronically draining ears. On examination child has failure to thrive with hepatosplenomegaly and exophthalmos. Probable diagnosis isHistiocytosis-XWegeners granulomatosisChronic granulomatous diseaseChediak-Higashi syndrome  <response>: Ans. a. Histiocytosis-X 