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': 'Sex worker with discharging ulcer, gram-negative diplococci & growth on modified\nThayer Martin media. Diagnosis \nSelect and explain. \nA. N. gonococci, B. Syphilis, C. LGV, D. Chancroid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Information in this question are -\ni. Gram negative diplococci.\nii. Growth on modified Thayer-Martin media.\n\nNeisseria gonorrhoeae is a gram negative diplococci and Thayer-Martin medium is the selective medium for gonococci.', 'role': 'assistant'}]