The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 5-years old child was presented with proptosis. Microscopic examination of the mass revealed a round cell tumor positive for Desmin immunohistochemical marker. Most likely diagnosis is ?   (A) Leukemia   (B) Embryonal rhabdomyosarcoma   (C) Lymphoma   (D) Primitive Neuroectodermal Tumor (PNET)
['(B) Embryonal rhabdomyosarcoma <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Leukemia \n (B) Embryonal rhabdomyosarcoma \n (C) Lymphoma \n (D) Primitive Neuroectodermal Tumor (PNET) <> possible answers', '  A 5-years old child was presented with proptosis. Microscopic examination of the mass revealed a round cell tumor positive for Desmin immunohistochemical marker. Most likely diagnosis is ? <> context@']