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: Surgery
Commonest shoulder dislocation 
Select and explain. 
A. Preglenoid, B. Subcoracoid, C. Posterior, D. Subclavicular
A: Preglenoid
Answer: A: Preglenoid 
Explanation: Ans. is 'a' i.e., Preglenoid Anterior dislocation of the shoulder is the most common type of shoulder dislocation. Head of the humerus comes out of the glenoid cavity and lies anteriorly. Anterior dislocation of shoulder could be : - Preglenoid It is the most common type of anterior dislocation and head lies in front of glenoid. Subcoracoid :- The head lies below the coracoid process. Subclavicular (infraclavicular) :- The head lies below the clavicle. Intrathoracic :- It is very rare.