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: Social & Preventive Medicine
[{'content': 'Causative agent for oriental sore is: September 2007 \nSelect and explain. \nA. Onchocerca volvulus, B. Leishmania donovani, C. Leishmania tropica, D. Brugya malayi', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Leishmania tropica Oriental sore is a skin disease, occurring in tropical and subtropical Africa and Asia, caused by the parasitic protozoan Leishmania tropica. It is a specific granuloma of the skin, endemic within ceain limited areas in warm countries; characterized primarily by a papule, gradually enlarging by peripheral and subjacent infiltration,with scaling or crusting, and which usually, sometimes with an inter-vening furunculoid stage, slowly breaks down and develops into an indolent ulcer. The disease takes the form of a slow-healing open sore or ulcer, which sometimes becomes secondarily infected with bacteria. Leishmania donovani causes kala-azar. Leishmania braziliensis causes muco-cutaneous leishmaniasis', 'role': 'assistant'}]