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
Metacarpophalangeal joint is coming under the following classification of joints: 
Select and explain. 
A. Plant joint, B. Condyloid joint, C. Ball and socket joint, D. Saddle shaped joint
B: Condyloid joint
Answer: B: Condyloid joint 
Explanation: Metacarpophalangeal joint is a type of condyloid joint. These joints have two distinct convex surfaces that aiculate with two concave surfaces. The movements of flexion, extension, abduction, and adduction are possible together with a small amount of rotation. Types of joints:Fibrous joints (e.g., Sutures of the vault of the skull, inferior tibiofibular joints)Cailaginous joints (e.g., Symphysis pubis)Synol jointsPlane joints (e.g., Sternoclavicular and acromioclavicular joints)Hinge joints (e.g., Elbow, knee, ankle)Pivot joints (e.g., Atlantoaxial and superior radio ulnar joints)Condyloid joints (e.g., Metacarpophalangeal joints)Ellipsoid joints (e.g., Wrist)Saddle joints (e.g., Carpometacarpal joint of the thumb)Ball-and-socket joints (e.g., Shoulder and hip joints)