After being hit on the head, Bob experienced some retrograde amnesia. Those who were there knew this because he
A) had a concussion.
B) was unconscious.
C) could not remember his name.
D) did not know what happened.

Question

Quizplus · Accepted Answer

Retrograde amnesia is a loss of memory for events that occurred before a certain point in time, usually a traumatic event. In this case, Bob experienced retrograde amnesia after being hit on the head, so he would not know what happened before he was hit.

After Being Hit on the Head, Bob Experienced Some Retrograde