What is the role of cluster of differentiation 55 (CD55) in the complement system?

A It acts as a receptor for complement component C3
B It inhibits the formation of the complement membrane attack complex ✓
C It enhances the activation of the complement cascade
D It has no role in the complement system

Explanation

CD55, also known as decay-accelerating factor (DAF), inhibits the formation of the complement membrane attack complex by preventing the assembly of C5b-9.

Source

Janeway's Immunobiology
Hematology Hematology: Blood Components Hematology: Blood Components Hard MEDICAL Confidence: high