In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: CONCLUSIONS : Among these Indian patients with stage II hypertension , the FDC of T + A was found to be significantly more effective , with regard to BP reductions , than A , and both treatments were well tolerated .
### Output Text:
CONCLUSIONS : Among these Indian patients with stage II hypertension , the FDC of T + A was found to be significantly more effective , with regard to BP reductions , than A , and both treatments were well tolerated . 