This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': "A renal mass seen on prenatal check up is most probably - \nSelect and explain. \nA. Wilm's tumour, B. Mesoblastic nephroma, C. Neuroblastoma, D. Renal sarcoma", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Mesoblastic nephromaEnlargement of a kidney on prenatal imaging is usually due to hydronephrosis or a cystic renal enlargement, such as multicystic dysplastic kidney or polycystic kidney disease.Solid tumors of the kidneys are rarely seen in the antenatal period, but can be diagnosed by ultrasound. Most common solid tumour is Mesoblastic nephroma", 'role': 'assistant'}]