This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: S.T.D., Subject name: Skin
[{'content': 'All the following features are associated with Chancroid except- \nSelect and explain. \nA. Painful ulcer, B. Painless lymphadenopathy, C. School of fish appearance on staining, D. Azithromycin is useful in treatment', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans is \'b\' i.e. Painless lymphadenopathy* Chancroid is associated with painful suppurative inguinal lymphadenopathy.Chancroid (soft chancre/soft sore)* Chancroid is an STD caused by H.ducreyi, a gram negative cocobacilli. Incubation period of chancroid is 1-7 days. Clinically it is characterized by: -i) Multiple ulcersii) Non-indurated or soft indurationiii) Painful (Tender)iv) Bleed easilyv) Undermined, sloughed erythematous edgesvi) Painful suppurative inguinal lymphadenopathyDiagnosis & Treatment* Gram\'s staining of swab from the lesion may reveal a predominance of characteristic gramnegative coccobacilli, arranged in parallel chains giving a "School offish" or "rail road track" appearance. An accurate diagnosis relies on cultures of H.ducreyi from the lesion.* Azithromycin is the DOC for treatment. Ceftriaxoney Ciprofloxacin & erythromycin are alternatives.', 'role': 'assistant'}]