How are hypersensitivities like allergies & anaphylaxis and autoimmune conditions like diabetes mellitus both overreactions of the body to an antigen?Which of these (hypersensitivity or autoimmune) is a reaction to a self-antigen?Which of these (hypersensitivity or autoimmune) is a reaction to a foreign antigen?

a. Both involve the body's exaggerated immune response to an antigen; Hypersensitivity is a reaction to a self-antigen, while autoimmune conditions react to a foreign antigen.
b. Both involve the body's exaggerated immune response to an antigen; Autoimmune conditions are a reaction to a self-antigen, while hypersensitivities react to a foreign antigen.
c. Only autoimmune conditions involve the body's exaggerated immune response to an antigen; they both react to self-antigens.
d. Only hypersensitivities involve the body's exaggerated immune response to an antigen; they both react to foreign antigens.

a. Both involve the body's exaggerated immune response to an antigen; Hypersensitivity is a reaction to a self-antigen, while autoimmune conditions react to a foreign antigen.

Explanation:

Both hypersensitivities (like allergies and anaphylaxis) and autoimmune conditions (like diabetes mellitus) involve the body's exaggerated immune response to an antigen.

In hypersensitivities, the immune response is triggered by exposure to a foreign antigen, such as pollen, food proteins, or certain medications.

In autoimmune conditions, the immune response is directed against self-antigens, components of the body's own cells or tissues, leading to tissue damage or dysfunction.