This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Male Genital Tract, Subject name: Pathology
A 4-year-old girl is brought to the physician by her parents who report seeing blood in the child's urine. A CT scan reveals a neoplasm of the urinary bladder. Which of the following is the most likely diagnosis? 
Select and explain. 
A. Angiosarcoma, B. Embryonal rhabdomyosarcoma, C. Leiomyosarcoma, D. Liposarcoma
B: Embryonal rhabdomyosarcoma
Answer: B: Embryonal rhabdomyosarcoma 
Explanation: Rhabdomyosarcoma, typically of the embryonal type, manifests most commonly in children as sarcoma botryoides. These edematous, mucosal, polypoid masses have been likened to a "cluster of grapes." Combined treatment with radiation therapy and chemotherapy has greatly increased survival rates for children with this neoplasm. The other choices are rarely, if ever, encountered in children.Diagnosis: Rhabdomyosarcoma, sarcoma botryoides