Which of the Following Is True Regarding Hypersensitivity Reactions

question 60

Multiple Choice

Which of the following is true regarding hypersensitivity reactions?

• A) They usually occur from first-time exposure to an antigen.
• B) There are four types (I-IV) of sensitivity reactions.
• C) They can occur without exposure to an antigen.
• D) Both a and b are correct.

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