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': 'Myeloperoxidase (MPO) and Periodic acid schiff\'s (PAS) are the two basic cytochemical stains, commonly used in diagnosis and typing of acute leukemias. MPO positive blasts are quite specific for acute myeloid leukemia (AML). However PAS block positivity is seen in Acute "Lymphoblastic" Leukemia (ALL), which has significance in absence of MPO positivity Perioral pallor and Dennie\'s line are seen in: \nSelect and explain. \nA. Atopic dermatiti, B. Chronic actinic dermatitis, C. Blood dyscrasia, D. Perioral contact dermatitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Atopic dermatitis', 'role': 'assistant'}]