Answer:
Retrograde amnesia
Step-by-step explanation:
Retrograde amnesia is defined as the injury of brain where people have inability to recall memories before onset of injury and it does not affect older memories much.
Retrograde amnesia can be caused by head and brain injuries due to traumatic events, overdose of some drugs, alcohol or other health condition such as Alzheimer's disease.
Retrograde amnesia can be a long term or short term injury depends on the cause of the injury.
Hence, the correct answer is "Retrograde amnesia".