What mechanism occurs in Raynaud phenomenon that classifies it as a type III hypersensitivity reaction?
A) Immune complexes are deposited in capillary beds, blocking circulation.
B) Mast cells bind to specific endothelial receptors that cause them to degranulate, creating a localized inflammatory reaction that occludes capillary circulation.
C) Cytotoxic T lymphocytes attack and destroy the capillaries so that they are unable to perfuse local tissues.
D) Antibodies detect the capillaries as foreign protein and destroy them using lysosomal enzymes and toxic oxygen species.
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