This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Anatomy
[{'content': 'A 70yr old male has a pathological fracture of femur. The lesion appears a lytic on X- rays film with a circumscribed punched out appearance .The curetting from fracture site is most likely to show which of the following? \nSelect and explain. \nA. Diminshed and thinned trabecular bone, B. Sheets of atypical plasma cells, C. Metaplastic prostatic adenocarcinoma, D. Malignant cells forming osteoid bone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Olf patients along with lytic circumscribed punched our X- rays appearance suggests multiple myeloma. Multiple myeloma most often presents as multifocal destructive bone tumours composed of plasma cells throughout the skeletal system.(ref Robbins 9/e p599,7/679)', 'role': 'assistant'}]