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: Dental
[{'content': 'False about syphilis is : \nSelect and explain. \nA. Incubation period is 9-90 days, B. Secondary syphilis is due to hematological dissemination, C. Syphilitic ulcers(Chancre) are extremely painful, D. "General paresis of Insane" is due to CNS involvement in tertiary syphilis.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Syphilitic ulcers(Chancre) are usually single in number, butter like, hard in consistency and typically painless.', 'role': 'assistant'}]