Question

CD in Immunology is :

• A. Compact disc
• B. Coronary disease
• C. Cluster of differentiation
• D. Cause of death

Hint:

CD markers are essentially the "nametags" of immune cells. A classic virology fact: the HIV virus explicitly targets immune cells that express the CD4 receptor (Helper T cells).

Answer 1

The Correct Option is C

Step 1: Concept:
The question asks for the expansion of the abbreviation "CD" as it is specifically used in the field of Immunology.

Step 2: Step-by-step Explanation:

• In immunology, CD stands for Cluster of Differentiation (or sometimes Cluster of Designation).

• It is a protocol and nomenclature system used for the identification and investigation of cell surface molecules providing targets for immunophenotyping of cells.

• CD molecules act as receptors or ligands important for cell signaling, or play a role in cell adhesion.

• Familiar examples include CD4 (found on Helper T cells) and CD8 (found on Cytotoxic T cells).

Step 3: Final Answer:
CD stands for Cluster of differentiation, matching option (C).