This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
[{'content': 'Painless effusion in congenital syphilis is called \nSelect and explain. \nA. Clutton joints, B. Baon joints, C. Chanrcot joinst, D. None of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: Skeletal manifestations of congenital syphilis Clutton's joints - Painless sterile effusions in the knees or elbows Parrot's joints - Effusion with epiphysitis and epiphyseal separation Erosion of the nasal boneThickening and expansion of the finger phalanges (dactylitis) Higoumenaki's sign - Bilateral enlargement of sternal end of the clavicle Saber tibia, Scaphoid scapula (Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 291)", 'role': 'assistant'}]