<prompt> QT prolongation is caused by:QuinidineOmeprazoleLidocainePenicillin  <response>: Ans. a. QuinidineRef: Goodman Gilman 12th eP. 821Drugs Causing QT prolongation:Antihistamines: Class la Quinidine and Class IIICisaprideAntipsychotics: Ziprasidone, sertindole, quetiapine, haloperidol, etc.Antidepressants: Tricyclic antidepressants like amitriptyline, SSRI like fluoxetineAntibiotics: Fluoroquinolones, erythromycinAntihistaminics: Astemizole, terfenadineAntifungals: KetoconazoleAntimalarials: Chloroquine, quinine, halofantrineAntivirals: Amantadine 