This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haemophilus, Subject name: Microbiology
[{'content': 'Causative organism of which STD has safety pin appearance- \nSelect and explain. \nA. LGV, B. Chancroid, C. Syphilis, D. Herpesgenitalis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Chancroid o Causative organisms of two STDs have safety pin (bipolar) appearance:i) Donovanosis or granuloma inguinale - Calymmatobacter granulomatosis.ii) Chancroid - H ducreyi", 'role': 'assistant'}]