You are answering a USMLE-style medical question. Question: A 2-year-old boy is brought to the physician because of decreased appetite and abdominal pain for the last several weeks. Physical examination shows a well-appearing toddler with a palpable left-sided abdominal mass that does not cross the midline. A CT of the abdomen shows a large, necrotic tumor on the left kidney. Histological examination of the kidney mass shows primitive blastemal cells and immature tubules and glomeruli. This tissue is most likely derived from the same embryological structure as which of the following? Options: A) Adrenal medulla B) Thyroid gland C) Papillary muscles D) Anterior pituitary " Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.