This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Protein Synthesis Inhibitors, Subject name: Pharmacology
A young female presented to the hospital OPD with suspected chlamydial infection. She was prescribed oral doxycycline for 2 weeks. After 3 weeks, she came to the hospital again with a mucopurulent cervicitis. On questioning, she admitted that she took the drug only for 3 days. What should be done next? 
Select and explain. 
A. Rewrite the original prescription for oral doxycycline, B. Treat her with an intravenous dose of amoxicillin, C. Write a prescription for oral erythromycin for 10 d, D. Treat her with a single oral dose of Azithromycin
D: Treat her with a single oral dose of Azithromycin
Answer: D: Treat her with a single oral dose of Azithromycin 
Explanation: Cervicitis is caused by C. Trachomatis. Treatment with oral doxycycline for 2 weeks would have eradicated C. Trachomatis and some other bacteria commonly associated with non-gonococcal cervicitis. Given the limited compliance of this patient a single oral dose of Azithromycin would be best for this patient