Select the correct definition of the word prognosis in the sentence: "The doctor's prognosis gave the patient and his family reason to feel optimistic about the surgery."

The correct answer is D: 'Outcome statement.' A prognosis refers to a prediction of the likely outcome of a disease or condition. In this context, the doctor's prognosis provided hope and positivity regarding the upcoming surgery by indicating a favorable outcome. Therefore, 'outcome statement' best defines the underlined word in the sentence. It is important for patients and their families to understand the prognosis as it helps them prepare for what lies ahead and provides insight into the potential results of the medical treatment or procedure.