Refer to the input text as context and select the correct relationship between 'Lafarge' and 'cement' from the available options.
Options: product/material produced, founded by, position held, platform

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