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: Surgery
[{'content': 'Swan neck deformity is seen in ? \nSelect and explain. \nA. Osteoahritis, B. Rheumatoid ahritis, C. Psoriatic ahritis, D. Gout', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is b' i.e., Rheumatoid ahritis Impoant deformities of hand in RA Boutonniere deformity : Flexion contracture of PIP joint and extension of DIP joint. Swan neck deformit: Hyperextension of PIP joint and flexion at DIP joint. Z-deformity : Radial detion of wrist with ulnar detion of fingers. Hyperextension of 1st interphalangeal joint and flexion of MP joint.", 'role': 'assistant'}]