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The term that refers to a prediction about the course of a disease is prognosis. In the medical field, prognosis is used to estimate the likely outcome of a patient’s disease based on various factors, including the nature of the disease, personal health history, and response to treatment. It helps both healthcare providers and patients understand the expected progression of the disease and make informed decisions about care and management options.

The other terms listed do not relate to predictions about disease outcomes. The autonomic nervous system is part of the nervous system responsible for regulating involuntary body functions. Keratin is a type of protein found in the skin, hair, and nails, essential for the structure of these tissues. Formaldehyde is a chemical compound often used in various industries, including preservation and manufacturing, but it does not pertain to disease prognosis or prediction.