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': 'Most haemorrhagic tumor is - \nSelect and explain. \nA. Leiomyosarcoma stomach, B. Ca stomach, C. Adeno Ca GB, D. Ca pancreas', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is \'a\' i.e. Leiomyosarcoma stomach "Leiomyosarcoma often ulcerate and bleed" - Harrison', 'role': 'assistant'}]