This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Plastic Surgery and Skin Lesions, Subject name: Surgery
Treatment of choice for melanoma is: 
Select and explain. 
A. Chemotherapy, B. Surgical excision, C. Radiotherapy, D. Surgery and chemotherapy
B: Surgical excision
Answer: B: Surgical excision 
Explanation: Treatment Surgical excision with Sentinel lymph node biopsy Margins to be taken depends on the tumor thickness and depth of invasion * < 1mm thickness - 1 cm margin * 1-4 mm thickness - 2cm margin * > 4mm thickness - 2-3 cm margin Malignant Melanoma is a radio resistant tumor *