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: Skin
Organisms with characteristic "school of fish" appearance in stained smears is seen in: 
Select and explain. 
A. Granuloma inguinale, B. Chancroid, C. Lymphogranuloma venereum, D. Herpes genitalis
B: Chancroid
Answer: B: Chancroid 
Explanation: Haemophilus ducreyi produce "school of fish" appearance.