This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
[{'content': 'The following tests help in laboratory diagnosis of Kala-azar except- \nSelect and explain. \nA. Bone marrow examination, B. Immobilisation test, C. Blood smear examination, D. Aldehyde test', 'role': 'user'}, {'content': 'Answer: B \nExplanation: laboratory diagnosis of kala azar direct evidence peripheral blood smear Culture Bone marrow aspirations Splenic puncture Lymphnode aspirate Antigen detection Polymerase chain reaction Animal inoculation (Refer pgno:41 baveja 3 rd edition)', 'role': 'assistant'}]