This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: VBDs, Arboviral & Viral Infections, Surface Infections, Subject name: Social & Preventive Medicine
Causative agent for 'Oriental sore' is:- 
Select and explain. 
A. Leishmania donovoni, B. Leishmania tropica, C. Leishmania braziliensis, D. Onchocerca volvulus
B: Leishmania tropica
Answer: B: Leishmania tropica 
Explanation: Leishmania tropica causes Cutaneous leishmaniasis and Oriental Sore. Leishmania donovoni causes Visceral leishmaniasis. (Kala azar) Leishmania brazeliensis causes Muco-cutaneous leishmaniasis. Onchocerca volvulus cause Onchocerciasis. (River blindness)