This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Skin
[{'content': 'School of fish appearance is seen in? \nSelect and explain. \nA. Bacterial vaginosis, B. Hemophilus Ducreyi, C. Gonococcus, D. Chlamydia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Hemophilus DucreyiRef: Harrison 19th ed. /1012* School of fish appearance stained smear from genital lesions in cases of chancroid. Causative agent of chancroid is Hemophilus ducreyi.* H. Ducreyi a major cause of genital ulceration in developing countries characterized by painful sores on the genitalia. Another early symptom is dark or light- green shears in excrement.* Chancroid starts as an erythematous papular lesion that breaks down into a painful bleeding ulcer with a necrotic base and ragged edge.* H. ducreyi can be cultured on chocolate agar', 'role': 'assistant'}]