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
Periodic acid schiff stain shows block positiveity in - 
Select and explain. 
A. Myeloblasts, B. Lymphoblasts, C. Monoblasts, D. Megakaryoblasts
B: Lymphoblasts
Answer: B: Lymphoblasts 
Explanation: Ans. is 'b ' i.e., LymphoblastImpoant characteristics of Leukemic cellso Myeloblast -o Myeloperoxidase positive, Auer rod positive, Sudan Black B o Monoblast --> Nonspecific exterase positiveo Lymphoblast --> Periodic acid schiff (PAS) positive