Please answer the following question: Answer the following question given this paragraph: The most common type of brain injury is a concussion. This is a bruise on the surface of the brain. It may cause temporary symptoms such as headache and confusion. Most concussions heal on their own in a few days or weeks. However, repeated concussions can lead to permanent changes in the brain. More serious brain injuries also often cause permanent brain damage. Q: What is the most common type of brain injury? Choices: - Diffuse Axonal - Anoxic Event - Contusion - concussion A:
A:
concussion