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: Medicine
All - Trans - Retinoic Acid is used in the treatment for: 
Select and explain. 
A. Acute Promyelocytic Leukemia (PML), B. Acute Lymphoid Leukemia (ALL), C. Chronic Myeloid Leukemia (CML), D. Chronic Lymphoid Leukemia (CLL)
A: Acute Promyelocytic Leukemia (PML)
Answer: A: Acute Promyelocytic Leukemia (PML) 
Explanation: All -Trans- Retinoic Acid is used in the treatment for Acute Promyelocytic Leukemia (PML) Ref: Harrison's Principles of Internal Medicine, 16th Edition, Page 636; Manual of Practical Medicine By R Alagappan, 3rd Edition, Page 347