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': "Chromosome involved in Wilm's tumor is \nSelect and explain. \nA. 11, B. 13, C. 18, D. 22", 'role': 'user'}, {'content': 'Answer: A \nExplanation: WTl is the best characterized Wilms tumor gene. It is located at chromosome llp13 and encodes for a transcription factor that is critical for normal development of kidneys and gonads. WT2 is localized to a cluster of genes at llpl5. Reference: Essential paediatrics; O.P.Ghai; Childhood Malignancies; Page no: 617', 'role': 'assistant'}]