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: Pharmacology
Large bilateral painless effusions of the knees occurring in late congenital syphilis in patients between ages 8 to 18 are designated as 
Select and explain. 
A. Clutton's joints, B. Ramsey's joints, C. Charcot's joints, D. Mercer's joints
A: Clutton's joints
Answer: A: Clutton's joints 
Explanation: .