Analyze the relationship between 'Holcim' and 'cement' within the context of the input sentence.
Options: creator, headquarters location, product/material produced, industry

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