This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal infections, Subject name: Orthopaedics
Painless effusion in joints in Congenital syphilis are called - 
Select and explain. 
A. Clutton's joint, B. Charcot's joint, C. Baon's joint, D. Chronic, osteomyelitis
A: Clutton's joint
Answer: A: Clutton's joint 
Explanation: Symmetrical ahrosis especially involving knee joint.Painless effusions in joints in congenital syphils are cluttons joints IMAGES SHOWING SYPHILITC BONY LESION AND DEFORMITY REF : MAHESWARI 9TH ED