Utilize the input text as a context reference, choose the right relationship between 'Lafarge' and 'cement' from the options.
Options: founded by, platform, position held, product/material produced

The firm has just named Wolfgang Reitzle as an advisory partner the very same Wolfgang Reitzle who hired Perella Weinberg as an adviser to steer the rocky $44bn (£28.2bn) merger between his Swiss cement firm Holcim and its French rival Lafarge (EUREX: 504482.EX - news ) .
product/material produced