A Technician Is Reading Plates from a Cerebrospinal Fluid (CSF)culture

A technician is reading plates from a cerebrospinal fluid (CSF) culture.She notices that there is growth on chocolate agar (CHOC) ,but no growth on sheep blood agar (SBA) or MacConkey (MAC) agar.The Gram stain showed a gram-negative bacillus.What organism should be suspected?

A) Streptococcus pneumoniae
B) Staphylococcus aureus
C) Haemophilus influenzae
D) Escherichia coli