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

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