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': '3dimensional information in IOPAs can be taken by: \nSelect and explain. \nA. Examining 2 films projected at right angle to each other, B. Examining 2 films projected at different angles, C. CLARK rule, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Image in a X-ray is a dimensional information. To exactly locate the position of an object a three dimensional information is necessary. To obtain this 2 methods can be used\n\nexamining two films projected at right angles to each other.\nexamining\xa0 two films projected at different angles called as CLARK Rule (or) Buccal object rule (or) Tube shift metro or LOB rule.', 'role': 'assistant'}]