The best description of overall structure of the part of the text is it explains what causes Pasteur to want to find a cure for rabies.
Louis Pasteur is a famous French chemist and microbiologist. He is known for discovering the cure for rabies.
He is also known for preventing diseases in silk eggs. Pasteurization is the process of preventing microbes that spoil milk or other beverages. The process is in his name.
Thus, the correct option is A, it explains what causes Pasteur to want to find a cure for rabies.
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