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
Which of the following statement is true in cytochemistry of ALL 
Select and explain. 
A. PAS positive (Block positivity), B. Myeloperoxidare positive, C. Sudon Black B positive, D. Non specific estesare positive
A: PAS positive (Block positivity)
Answer: A: PAS positive (Block positivity) 
Explanation: Solution:

In L1 and L2 sub types of ALL ( B cell - ALL) PAS positive Blocker are seen in Lymphoblasts on clear Cytoplasmic background.
In T Cell - ALL and in L3 Sub type of ALL. PAS reaction is negative.