Which of the follwing statements regarding drugs used in leprosy is FALSE?

(Ref: KDT 6/e p752, 753) Acedapsone is a repository form od dapsone. Single i,m. injection of acedapsone keep on releasing the drug for 3 months. Rifampicin is used once in a month (supervised dose) for the treatment of leprosy. It prevents the emergence of resistance to dapose. Clofazimine can result in skin pigmentation, disclolouration of secretions and dryness of skin (icthyosis). Clofazimine has no cross-allergenicity with dapsone.