This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'Tabes dorsalis is seen in:- \nSelect and explain. \nA. Primary syphilis, B. Secondary syphilis, C. Teiary syphilis, D. Latent syphilis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Tabes dorsalis/syphilitic myelopathy- slow degeneration of the nerves primarily in the dorsal columns of the spinal cord These nerves- maintain a person's sense of position, vibration, and discriminative touch. Tabes dorsalis is caused by demyelination caused by advanced syphilis infection (teiary syphilis), when the primary infection by Treponema pallidum is left untreated for an extended period of time", 'role': 'assistant'}]