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: Skin
[{'content': "Which of the following malignancy does not show lymphatic metastasis? \nSelect and explain. \nA. Squamous cell Ca, B. Basal cell Ca, C. Malignant melanoma, D. Kaposi's sarcoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Basal cell Ca is a low grade malignancy which spread by local invasion and does not show lymphatic metastasis. It is a well defined, firm lesion with waxy beaded margin. The ideal treatment of choice is excision with 0.5cm of normal skin margin. Ref: Illustrated synopsis of Dermatology and Sexually transmitted disease 2nd edn, By Neena Khanna page 308.', 'role': 'assistant'}]