This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Childhood Tumors, Subject name: Pediatrics
[{'content': 'A grape like, polypoid, bulky mass protruding through vagina in a 4-year-old girl is characteristic of: \nSelect and explain. \nA. Fibrosarcoma, B. Sarcoma botryoides, C. Leiomyosarcoma, D. Inflammatory polyp', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Sarcoma botryoides(Ref: Nelson's 20/e p 2468, Ghai 8/e 618 Sarcoma Botryoides)It is a variant of the embryonal form of RMSTumor cells & an edematous stroma project into a body cavity like a bunch of grapes.", 'role': 'assistant'}]