Which term means to occur again?

• A. Prognosis
• B. Recur
• C. Preexisting
• D. Primary

Answer: (B)

The main idea tested here is understanding vocabulary for events that happen again. To recur means to happen again after a period of time. In a medical context, a symptom or illness that recurs comes back after a break, which is exactly what "to occur again" describes.

Prognosis is about predicting how a disease will progress or its likely outcome, not about something happening again. Preexisting describes something that already existed before a certain time. Primary refers to the first occurrence or the main/initial status. So the term that fits "to occur again" is recur, because it captures the idea of repetition after a pause.