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. E.coli
A: Staphylococcus epidermidis
Answer: A: Staphylococcus epidermidis 
Explanation: Among the options provided common contaminant in positive blood culture is Staphylococcus epidermidis (Coagulase negative staphylococcus- CONS) followed by other normal skin flora (other bacteria like Propionibacterium spp) and Candida species.Ref: Ananthanarayan 9th edition, p 622