This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic Bone Disease, Subject name: Orthopaedics
Following X-ray foot is showing features of which disease- 
Select and explain. 
A. Gout, B. Rheumatoid arthriris, C. Osteoarthritis, D. Psoriatic arthristis
A: Gout
Answer: A: Gout 
Explanation: .Ans. is 'a' i.e., Gout* Given X-ray image is showing juxtra-articular erosive changes around the first metatarsophalangeal joint with overhanging edges and moderate soft tissue swelling.* Note the tophus, classical finding of gout.