This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
[{'content': 'In a patient with gouty ahritis, synol fluid aspiration will show- \nSelect and explain. \nA. Needle shaped crystals, B. Rhomboid shaped crystals, C. Mononuclear leucocytosis, D. Polymorphonuclear leukocytosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: During acute gouty attacks, needle-shaped MSU crystals typically are seen both intracellularly and extracellularly . With compensated polarized light, these crystals are brightly birefringent with negative elongation. Ref - Harrisons 20e p2632', 'role': 'assistant'}]