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: Dental
[{'content': 'Which of the following regarding air abrasion is false? \nSelect and explain. \nA. No tactile sensation, B. It can be a substitute for acid-etching technique, C. Cannot be used for cavity preparation, D. All of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Roughening by air abrasion by itself is not a substitute for acid-etching techniques. Roughening improves bonding. Acid etching alone or after roughening, however, always produces a better bond than air abrasion alone.\nContemporary air abrasion equipment is helpful for stain removal, debriding pits and fissures before sealing\xa0and micromechanical roughening of surfaces to be bonded.\nRef: Sturdevant's art and science of operative dentistry. 4th edition page 328", 'role': 'assistant'}]