Answer: A

Reasoning: The WHO multidrug therapy (MDT) regimen for paucibacillary leprosy consists of two drugs—rifampicin (600 mg once monthly, supervised) plus dapsone (100 mg daily, self-administered)—given for 6 months. Studies describing the standard WHO schedule confirm this 2-drug, 6-month course for PB cases, while 3-drug, 12-month regimens are reserved for multibacillary disease [Katoch et al., 1987, PMID 3559333].