This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Extremity, Subject name: Anatomy
A 29-year-old patient has a dislocated elbow in which the ulna and medial part of the distal humerus have become separated. What classification of joint is normally formed between these two bones? 
Select and explain. 
A. Trochoid, B. Ginglymus, C. Enarthrodial, D. Synarthrosis
B: Ginglymus
Answer: B: Ginglymus 
Explanation: Ginglymus joint is the technical term to describe a hinge joint. It allows motion in one axis (flexion and extension in the case of the elbow) and is therefore a uniaxial joint. The other types of joints listed allow motion in more than one axis.