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
High resolution is obtained with: 
Select and explain. 
A. Intraoral films with direct exposure, B. Extraoral films with intensifying screen, C. OPG, D. All of the above
A: Intraoral films with direct exposure
Answer: A: Intraoral films with direct exposure 
Explanation: Intraoral dental X-ray film is made as a double-emulsion film—that is, both sides of the base are coated with an emulsion. With a double layer of emulsion, less radiation is required to produce an image.  Direct exposure film is used for intraoral examinations, because it provides higher resolution images than screen-film combinations. Some diagnostic tasks, such as detection of incipient caries or early periapical disease, require this higher resolution.
Reference: White and Pharoah's Oral Radiology Principles and Interpretation 7th edition page no 64