After repeated exposure, which of the following will cause an allergic reaction?

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Multiple Choice

After repeated exposure, which of the following will cause an allergic reaction?

Explanation:
Repeated exposure to certain chemicals can train the immune system to react to them. These substances are sensitizers. After an initial contact that may not cause noticeable symptoms, the body becomes primed; on later exposures, the immune response is activated, leading to an allergic reaction such as contact dermatitis or respiratory symptoms in susceptible individuals. This is different from irritants, which cause inflammation based on dose without needing prior sensitization. Carcinogens relate to cancer risk, and convulsants affect the nervous system, but neither necessarily causes an allergic reaction after repeated exposure.

Repeated exposure to certain chemicals can train the immune system to react to them. These substances are sensitizers. After an initial contact that may not cause noticeable symptoms, the body becomes primed; on later exposures, the immune response is activated, leading to an allergic reaction such as contact dermatitis or respiratory symptoms in susceptible individuals. This is different from irritants, which cause inflammation based on dose without needing prior sensitization. Carcinogens relate to cancer risk, and convulsants affect the nervous system, but neither necessarily causes an allergic reaction after repeated exposure.

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