Direction: Identify the odd one out from the given statement and mark as your answer: 

1. The majority of people who develop these issues are athletes who participate in popular high-impact sports, especially football.

2. In extreme cases, people suffering from CTE have even committed suicide or homicide.

3. Recent studies suggest that people who suffer multiple concussions are at significant risk for developing chronic traumatic encephalopathy (CTE). 

4. Players who have suffered a head injury on the field must undergo a concussion sideline assessment.

5. These psychological problems can include depression, anxiety, memory loss, inability to concentrate, and aggression.