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: Epinephrine has a proven role in cardiac arrest in prehospital care ; however , use by paramedics in patients with suspected allergic reaction and severe hypertension should be viewed with caution .
### Output Text:
<span class="chemical">Epinephrine</span> has a proven role in cardiac arrest in prehospital care ; however , use by paramedics in patients with suspected allergic reaction and severe hypertension should be viewed with caution . 