A 60-year-old man presents with a brown-black lesion with asymmetry, irregular border, color variegation, and diameter of 7 mm on his back. Biopsy confirms melanoma with Breslow thickness of 1.2 mm. What is the recommended surgical margin?
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A
0.5 cm margin
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B
1 cm margin
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C
2 cm margin
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D
3 cm margin