In the context of the input sentence, determine the relationship between 'Glencore' and 'mining'.
Options: subsidiary, business division, founded by, industry

Glencore (Xetra: A1JAGV - news ) and Anglo American (LSE: AAL.L - news ) were the top fallers after Investec (LSE: INVP.L - news ) said the challenging environment for the sector calls into question the equity value of the mining companies.
industry