<prompt> Which of the following drugs is useful in the treatment of infection by Mycobacterium avium complex?IsoniazidClarithromycinCycloserineRifampicin  <response>: Treatment of MAC infection is REC Rifabutin Ethambutol ClarithromycinClarithromycin alone can be used for the prophylaxis of MAC infections in HIV positive patients.Azithromycin can also be used in place of clarithromycin. 