Which of the following is a long-term outcome example?

• A. Bleeding within days
• B. Infections within weeks
• C. Acute adverse reaction
• D. Cancer or fractures over years

Answer: (D)

Outcomes in studies are defined by when they occur after exposure. Long-term outcomes are events that appear after extended follow-up, often years, reflecting chronic effects and late consequences. The example that fits this is cancer or fractures over years, because these conditions typically take a long time to develop and only become evident after a prolonged observation period. In contrast, bleeding within days and infections within weeks are clearly short-term events, and an acute adverse reaction occurs soon after exposure. So the long-term outcome example is cancer or fractures over years.