Answer:
retrograde
Step-by-step explanation:
Retrograde amnesia: In abnormal psychology, the term "retrograde amnesia" is also written as RA, and is described as one of the different types of amnesia that occurs when an individual loses his or her memories that generally accesses different events that have already been occurred or information that has been learned by him or her in past.
Retrograde amnesia is being caused through the onset of a specific disease or an injury. It can either be temporary or permanent and is entirely dependent on the cause of the disorder.
In the question above, Omar's amnesia is best described as retrograde.