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: Pathology
[{'content': 'Primary pleural tumor is -a)  Mesotheliomab)  Myxomac)  Lipomad)  Fibroma \nSelect and explain. \nA. b, B. c, C. ac, D. ad', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pleural tumors \n\nThe pleura may be involved by primary or secondary tumors.\n1. Primary tumors\nBenign\xa0\xa0\xa0\xa0→ Solitary fibrous tumor (benign fibrous mesothelioma or benign mesothelioma or\xa0pleural fibroma).\nMalignant\xa0→\xa0 Malignant mesothelioma.\n2.\xa0\xa0 Secondary tumors\nMore common than primary tumors.\nMost common primary sites are lung and breast.', 'role': 'assistant'}]