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
Gout is a disorder of- 
Select and explain. 
A. Purine metabolism, B. Pyriniidine metabolism, C. Ketone metabolism, D. Protein metabolism
A: Purine metabolism
Answer: A: Purine metabolism 
Explanation: Gout is the most common inflammatory ahritis in men and in older women. It is caused by deposition of monosodium urate monohydrate crystals in and around synol joints due to abnormal purine metabolism . Ref Davidsons 23e p1013