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': 'Difference between Fluoride Gel and Varnish: \nSelect and explain. \nA. Gel given by tray where as varnish cannot, B. Gel application is not for office use, C. More number of applications can be done by varnish, D. Gel penetrates the inter proximal surface better, while varnish cannot', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]