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
[{'content': 'A 50 year old male patient complains of restricted mouth opening. Patient had undergone TMJ surgery 3 weeks back. Arthrography was done which revealed fibrous adhesions in joint space. Which of the following is most likely to be occurred during the diagnostic procedure in this patient? \nSelect and explain. \nA. Resistance to injection of contrast agent, B. Free flow of contrast agent, C. No contrast agent can be injected, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Adhesions may restrict normal\xa0movement of the disc during the mandibular opening, resulting in a “stuck disc” and possible closed lock. Adhesions are best identified with arthrography by\xa0resistance to injection of contrast agent.\nWhite and Pharoah, Oral radiology, ed 7th, pg-506', 'role': 'assistant'}]