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': 'Synovial sarcoma cellular markers are -a) Cytokeratinb) S-100c) Vimentind) Calretinin \nSelect and explain. \nA. abc, B. bc, C. acd, D. bcd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Immunohistochemistry: these tumors have spindle cells which are positive for vimentin and epithelial components positive for cytokeratin. More recently, molecular diagnostic studies have identitied a unique translocation, t (X;18), producing SYT/SSX1 or - SSX2 fusion genes. S-100 staining may give positive results.', 'role': 'assistant'}]