The patient, male, 15 years old, was admitted to the hospital due to
sudden high fever up to 39℃ 3 days ago, accompanied by chills,
severe headache, frequent vomiting in the form of jet,
unconsciousness, coma, blood pressure of 70/30mmhg, and red spots on
the skin. Gram-negative, nonmotile diplococcus was found in blood
culture. What is the most likely cause of this patient's infection
()
选项：

A:Streptococcus pneumonia
B:Staphylococcus aureus
C:Neisseria meningitides
D: coli