Which of the following types of experimental evidence suggests that a particular organism thought to be part of the human microbiome is,in fact,just a laboratory contaminant?

A)Absence of ribosomal RNA evidence in a specific host location where the organism was believed to have colonized
B)Presence of ribosomal RNA evidence in a specific host location where the organism was believed to have colonized
C)Absence of ribosomal RNA evidence in a specific host location where the organism was not expected to have colonized
D)Presence of ribosomal RNA evidence in a specific host location where the organism was not expected to have colonized