This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexually Transmitted Infections, Subject name: Dental
[{'content': 'Dose of acyclovir in a patient suffering from herpes labialis: \nSelect and explain. \nA. 200 mg, five times a day for 5 days, B. 400 mg, five times a day for 3 days, C. 600 mg, five times a day for 5 days, D. 800 mg, five times a day for 7 days', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Herpes labialis by HSV-I - T/t Acyclovir 200mg 5 times a day for 5-7 days Recurrent H.labialis (i.e. >6 episodes 1yr) - prophylactic therapy Acyclovir 400mg BDx 6 Months Herpes genitalis HSV-II - T/t Acyclovir 400mg TDS for 5-7 days', 'role': 'assistant'}]