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A valedictorian is the student who has achieved the highest academic standing in their graduating class. This individual typically earns the title by having the best grades or overall academic performance throughout their time in school. The valedictorian is often chosen to deliver the farewell speech, known as the valedictory address, at graduation ceremonies, where they may reflect on the experiences of the class and offer words of encouragement for the future.

An antidote is a substance or treatment given to neutralize the effects of a poison or toxic substance in the body. It helps to reduce or reverse the harmful effects caused by the poison. Antidotes are given in emergency situations to prevent serious harm to the affected individual, and their effectiveness depends on the specific poison harming an individual and how quickly they are given to help the individual.

An antigen is a foreign substance that triggers an immune response in the human body. It can be a molecule, such as a protein or a carbohydrate, that is recognized as non-self by the immune system. Antigens are often found on the surface of pathogens, such as bacteria or viruses, but can also be present on allergens or cells from transplanted organs. When the immune system encounters an antigen, it initiates an immune response to eliminate or neutralize it. This response involves the production of antibodies, activation of immune cells, and the development of immune memory. Antigens are crucial for the body's ability to distinguish between self and non-self and play a vital role in immune defense and disease recognition.