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: Radiology
A 24-year-oid male, known epileptic, presented following a seizure with pain in the right shoulder region. Examination revealed that the right upper limb was adducted and internally rotated and the movements could not be performed. Which of the following is the most likely diagnosis? 
Select and explain. 
A. Posterior dislocation of shoulder, B. Luxatio erecta, C. Intrathoracic dislocation of shoulder, D. Subglenoid dislocation of shoulder
A: Posterior dislocation of shoulder
Answer: A: Posterior dislocation of shoulder 
Explanation: Ans. Posterior dislocation of shoulder