Delayed hypersensitivities (type iv)
a. include anaphylactic shock, a systemic vasodilation that results in inadequate blood delivery to all tissues
b. are caused by t cells attacking hapten agent/self-protein complexes and include allergic contact dermatitis
c. are mediated by ige and il-4
d. are mediated by b cells and complement proteins
e. include reactions that occur after a mismatched blood transfusion

Option (4).

Explanation:

The exaggerated or hyper active response of the immune system are responsible for the hypersensitive reactions. These reactions are harmful for the body.

Delayed hypersensitivities or Type IV hypersensitivities is mediated by T cells. The T cells attacks the self protein complex and causes the allergic contact dermatitis.

Thus, the correct answer is option (B).

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