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: Microbiology
[{'content': 'RK - 39 antigen testing is done in \nSelect and explain. \nA. Kala azar, B. Chagas disease, C. African sleeping sickness, D. American sleeping sickness', 'role': 'user'}, {'content': 'Answer: A \nExplanation: RK - 39 test is a Immunochromatographic test done in Kala azar.', 'role': 'assistant'}]