This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Which is the most common contaminant in a positive blood culture 
Select and explain. 
A. Staphylococcus epidermidis, B. Bacteriodes, C. Candida, D. Aceinobacter
A: Staphylococcus epidermidis
Answer: A: Staphylococcus epidermidis 
Explanation: Staphylococcus epidermidis is the most common contaminant in positive blood culture among the given bacteria. Ref ananthnarayana and panikers microbiology textbook 8/e