This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
The most impoant source of Infection for meningococci is 
Select and explain. 
A. Case, B. Subclinical case, C. Carriers, D. Latent case
C: Carriers
Answer: C: Carriers 
Explanation: The human nasopharynx is the only reservoir of the Meningococcus. Natural infection is limited to the nasopharynx. Asymptomatic nasopharyngeal carriers rarely contract the illness but serve right infect their contacts. During the inter-epidemic period, the carrier rate is 5-10 percent. An increase in carriers rate heralds the onset of an epidemic. During epidemics, the carrier rates of closed communities may go up to 90 percent. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 232