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': 'Which of the following statement is true in cytochemistry of ALL \nSelect and explain. \nA. PAS positive (Block positivity), B. Myeloperoxidare positive, C. Sudon Black B positive, D. Non specific estesare positive', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Solution:\n\nIn L1 and L2 sub types of ALL ( B cell - ALL) PAS positive Blocker are seen in Lymphoblasts on clear Cytoplasmic background.\nIn T Cell - ALL and in L3 Sub type of ALL. PAS reaction is negative.', 'role': 'assistant'}]