This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
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 antemoem diagnosis is - 
Select and explain. 
A. 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
B: Corneal impression smear for immunofluorescence stain
Answer: B: Corneal impression smear for immunofluorescence stain 
Explanation: Specimen tested in rabies are corneal smears and skin biopsy in ante moem analyzed by immunoflurescent REF:ANANTHANARYANAN TEXTBOOK OF MICROBIOLOGY 9EDITION PGNO.534