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: Moreover , we detected a novel polymorphism in intron 11 that presumably is linked to the mutation responsible for C7D in case 1 .
### Output Text:
Moreover , we detected a novel polymorphism in intron 11 that presumably is linked to the mutation responsible for <span class="disease">C7D</span> in case 1 . 