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: Anatomy
Which is true about synol joint ? 
Select and explain. 
A. Stability is inversely propoional to mobility, B. Hyaline cailage covers aicular surface of all synol joints., C. Metacarpo-phalangeal joint is a hinge joint, D. "Cailage usually divides the joint into two cavities".
A: Stability is inversely propoional to mobility
Answer: A: Stability is inversely propoional to mobility 
Explanation: A i.e. Stability is inversely propoional to mobility