This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Surgery
[{'content': 'Elderly man with long-standing mole over the face which is increasing in size and showing irregular border. Diagnosis: \nSelect and explain. \nA. Superficial spreading melanoma, B. Lentigo maligna, C. Acral melanoma, D. Nodular melanoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lentigo maligna- occur on face sun exposed areas of older individuals,long standing cases,manifests as a flat,dark,variably pigmented lesion,with irregular borders and a history of slow development,best prognosis Superficial spreading melanoma- m/c type , m/c site torso/trunk Nodular- most malignant,veical growth phase + Acral melanoma-least common ,m/c site great toe nail', 'role': 'assistant'}]