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

### Input Text: The ninth component of human complement ( C9 ) is the last of the terminal complement components creating the membrane attack complex .
### Output Text:
The ninth component of human complement ( C9 ) is the last of the terminal complement components creating the membrane attack complex . 