This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lukemia, Subject name: Pathology
Auer rods are formed from? 
Select and explain. 
A. Primary granules, B. Secondary granules, C. Myeloperoxidase, D. All of these
A: Primary granules
Answer: A: Primary granules 
Explanation: ANSWER: (A) Primary granulesREF: Robbins 8th edition page 63'Auer rods are formed from Azurophil granules which are also known as Primary granules"