<prompt> Which of the following drugs is LEAST effective luminal amoebicide?MetronidazoleDiloxanide furoateIodoquinolParomomycin  <response>: Ref: KDT 6e p798, 799 Metronidazole is least effective luminal amoebicide because it is almost completely absorbed in small intestine and little drug is available to act in the colon. 