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: Microbiology
[{'content': '25 year old labourer 3 years back presented with penile ulcer not treated. Later he presented with neurological symptoms for which he got treated. Test to monitor response to treatment is - \nSelect and explain. \nA. VDRL, B. FTA-ABS, C. TPI, D. RPR', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]