What is the function of the blood component that expresses CD47, a transmembrane protein?

A Antigen presentation to T-cells
B Inhibition of complement-mediated phagocytosis ✓
C Activation of platelets during hemostasis
D Regulation of erythropoiesis

Explanation

CD47 is a transmembrane protein that inhibits complement-mediated phagocytosis by binding to signal-regulatory protein alpha (SIRPα) on macrophages, thus preventing the removal of self-cells.

Source

Nature Reviews Immunology
Hematology Hematology: Blood Components Hematology: Blood Components Hard MEDICAL Confidence: high