<prompt> A previously healthy child has sudden onset of red spots on body. There is a history of a preceding viral infection 1-4 weeks before the onset.Dengue feverHemophilia AThrombotic thrombocytopenic purpuraIdiopathic thrombocytopenic purpura  <response>: d. Idiopathic thrombocytopenic purpuraAcute onset purpura and thrombocytopenia in a previously healthy child, with preceding history of viral infection is suggestive of ITP 