Meningitis can be caused by a number of microbes, and the causative organism is often identified by microscopic observation of the cerebrospinal fluid. Identify the mismatch in the following list of organisms and the description of the microscopic observation.
A. Listeria monocytogenes; gram-negative coccobacillus with flagella
B. Streptococcus pneumoniae; gram-positive flattened coccus
C. Neisseria meningitidis; gram-negative diplococcus
D. Enterovirus; no bacteria appear to be present in CSF
E. Cryptococcus neoformans; fungal cells with a thick capsule
Answer: A
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