Refer to the input text as context and select the correct relationship between 'RATP' and 'public transport' from the available options.
Options: parent organization, industry, founded by, distributed by

The leading private operator of public transport systems in Spain, Avanza won a bid for the contract in June over French rivals RATP and Transdev, Britain's National Express (LSE: NEX.L - news ) and Barraqueiro of Portugal.
industry