Which of the following theories says an "injury" occurred when the injured person first experienced the disease-causing substance?

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The exposure theory suggests that an "injury" occurred when the injured person was first exposed to the disease-causing substance. It posits that the resulting health effects are a consequence of that initial exposure, which set off a chain of events leading to illness or injury. The double trigger theory and manifestation theory both focus on the complex interactions between multiple factors, rather than on a single causal event. The retroactive theory, on the other hand, proposes that injuries or illnesses only become apparent after some time has passed, making it unlikely to explain the onset of a disease-causing substance.

Which of the Following Theories Says an "Injury" Occurred When