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: Pharmacology
[{'content': "Which one of the following statements about doxycycline is FALSE ? \nSelect and explain. \nA. It is bacteriostatic, B. It is excreted mainly in the feces, C. It is more active than tetracycline against H.pylori, D. It is used in Lyme's disease", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]