premise: The Rock ‘n’ Roll Mardi Gras Marathon is an annual international marathon race which takes place in New Orleans, Louisiana, in the United States. It is part of the Rock 'n' Roll Marathon Series of road running competitions and it also features the Rock ‘n’ Roll Mardi Gras Half Marathon.
hypothesis: The marathon occurs once every 12 months.
reason: The marathon is annual, once every 12 months.