This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute Lymphoblastic Leukemia, Subject name: Pathology
[{'content': 'How will you differentiate a mediastinal mass being a thymoma or ALL? \nSelect and explain. \nA. Cytokeratin, B. CD1a, C. Cd3, D. Tdt', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Marker specific for thymoma is Cytokeratin Other markers for thymoma include : P 63, PAXp-8 . Most sensitive and specific marker for thymoma is FOXN 1 Markers common for both thymoma and T-ALL include: CD1a CD3 TDt Marker specific for thymoma is Cytokeratin Other markers for thymoma include : P 63, PAXp-8 . Most sensitive and specific marker for thymoma is FOXN 1 FOXN1 > >CD 205', 'role': 'assistant'}]