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