<prompt> A 45 year old lorry driver from Bihar presented with multiple necrotic ulcer which are painful on the penis. Tender inguinal lyphadenopathy was also present. What is the diagnosis ?H. ducreyiHerpes simplexSyphilisChlamydia infection  <response>: Chancroid is a sexually transmitted infectious disease characterized by painful genital ulcers, bubo formation, and painful inguinal lymphadenopathy. The causative organism is Haemophilus ducreyi. It is a gram-negative, fastidious, facultative, anaerobic coccobacillus. It is usually located in the extracellular spaces and is strictly a human pathogen. 