This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 1 (Protozoology), Subject name: Microbiology
[{'content': 'The following tests help in lab diagnosis of Kala azar except - \nSelect and explain. \nA. Bone marrow examination, B. Immobilization test, C. Blood smear examination, D. Aldehyde test', 'role': 'user'}, {'content': 'Answer: B \nExplanation: All other tests are used except Immobilization test. Lab diagnosis :-', 'role': 'assistant'}]