How are carcinogens and sensitizers different in terms of health effects?

• A. Carcinogens increase cancer risk; sensitizers cause allergic reactions or hypersensitivity upon exposure.
• B. Carcinogens cause immediate acute toxicity; sensitizers have no effect.
• C. Carcinogens cause allergic reactions; sensitizers cause cancer.
• D. They are the same.

Answer: (A)

The main idea is that these two types of agents affect health in very different ways. Carcinogens increase the risk of cancer by damaging DNA and disrupting cellular control, which can lead to malignant transformation over time. Sensitizers, by contrast, provoke an immune-mediated response after a person has been sensitized, causing allergic reactions or hypersensitivity upon subsequent exposures. This often shows up as contact dermatitis, asthma, or other immune-mediated symptoms rather than cancer.

So the best answer captures the distinct outcomes: carcinogens raise cancer risk, while sensitizers trigger allergic or hypersensitivity reactions. It’s not about immediate toxicity or about both causing the same effect; those ideas don’t fit the differences in mechanism and outcome.