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: Surgery
[{'content': 'Commonest cancer in burn scar is - \nSelect and explain. \nA. Sq. cell Ca, B. Fibrosarcoma, C. Adenoa Ca, D. Adeno-squamous Ca', 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer is 'a' i.e. Sq. Cell Ca. Malignancy arising in burn scar is k/a Marjolin's ulcer. It is most commonly squamous cell ca, although basal cell carcinomas may also be seen.", 'role': 'assistant'}]