This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Askin&;s tumour is- \nSelect and explain. \nA. Primitive neuroectodermal tumour of chest wall, B. Merkell cell carcinoma of skin, C. Paraneoplastic tumour of chest wall, D. Common bile duct tumour', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Develop from soft tissues of chest. A member of ewings family of tumours. A rare case of thoracopulmonary tumour. Computed tomography. Histopathology. Histo studies.. Used for diagnosis.', 'role': 'assistant'}]