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': 'Regarding syphilis, all are true, except -a) VDRL titre decreases or even absent after treatmentb) VDRL becomes positive after 10-14 days of infectionc) Earliest serological test to become positive in untreated primary syphilis is TPHAd) Yaws and Pinta cannot be differentiated \nSelect and explain. \nA. bc, B. c, C. ac, D. ad', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]