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': 'A 15 year old girl was admitted to the infectious disease hospital with a provisional diagnosis of rabies. The most suitable clinical sample that can confirm the antemortem diagnosis is- \nSelect and explain. \nA. Serum for anti-rabies IgG antibody, B. Corneal impression smear for immunofluorescence stain, C. CSF sample for viral culture, D. Giemsa stain on smear prepared from salivary secretions', 'role': 'user'}, {'content': 'Answer: B \nExplanation: For the antemortem diagnosis of rabies, viral antigens can be demonstrated in the corneal smear, skin biopsy from the face or neck\xa0or saliva.', 'role': 'assistant'}]