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 states that the injury occurred when the person first comes in contact with the disease-causing substance. This is in contrast to the Manifestation theory, which states that the injury occurs when the person first experiences symptoms or signs of the disease. The Double trigger theory relates to the development of autoimmune diseases, and the Retroactive theory proposes that an injury occurs after the disease has manifested.

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