Take context from the input text and decide on the accurate relationship between 'Sanofi' and 'Regeneron Pharmaceuticals' from the options provided.
Options: chairperson, stock exchange, owner of, chief executive officer

LONDON, July 24 (Reuters) - A new type of cholesterol drug from Sanofi and Regeneron Pharmaceuticals won a green light from European regulators on Friday, two months behind a rival product from Amgen.
owner of