This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplasia, Subject name: Surgery
[{'content': "Most common malignancy in marjolin's ulcer \nSelect and explain. \nA. Adenocarcinoma, B. Squamous cell carcinoma, C. Basal cell carcinoma, D. Malignant fibrous histiocytoma", 'role': 'user'}, {'content': "Answer: B \nExplanation: (B) Squamous cell carcinoma) (29, 548- Bailey & Love)A squamous cell carcinoma known as Marjolin's ulcer being the most common (Leg ulcers)Most frequently associated with * Chronic venous ulcer* Long standing burn scar* Squamous cell carcinoma developing in long standing scar/ulcers* Adenocarcinomas are the most common histological subtype of stomach cancer * *** Gastric carcinomas are often associated with hypochlorhydria /achlorhydria* Gastric carcinomas are relatively radioresistant* Maleny's ulcer (Burro wing ulcer) is caused by synergistic infection by Microerophilic Nonhaemolytic streptococci and Aerobic, Hemolytic staphylococci", 'role': 'assistant'}]