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: Pubertal exposure to Bisphenol A increases anxiety - like behavior and decreases acetylcholinesterase activity of hippocampus in adult male mice .
### Output Text:
Pubertal exposure to <span class="chemical">Bisphenol A</span> increases anxiety - like behavior and decreases acetylcholinesterase activity of hippocampus in adult male mice . 