<prompt> N. meningitis can be due to deficiency of this complement system:C1 - C4 deficiencyC5 - C9 deficiencyC3 deficiencyC2 deficiency  <response>: Ref: Textbook of Microbiology by Surinder Kumar, P 262 Meningococcal disease is favoured by deficiency of the terminal complement components C5-C9.Human genetic deficiencies of complement components and associated diseasesComplement deficiencyAssociation with diseaseC1 inhibitorHereditary angioneurotic edemaC1Systemic lupus erythematosus-like disease, frequently fatal from overwhelming infectionC2Increased susceptibility to infectionsC3Recurrent bacterial infectionsC4Systemic lupus erythematosus-like diseaseC5Recurrent infections-lupus-like diseaseC6, C7, C8Recurrent infections: Disseminated gonococcal infectionsC9Not more susceptible to disease than other individuals in the general populationFactor 1Low C3 levels with recurrent bacterial infections 