Alzheimer's Patients Often Suffer from a Variety of Symptoms Including

Alzheimer's patients often suffer from a variety of symptoms including memory loss, such as where they are, the date and time and people they may have just met. But it is not unusual for these patients to remember their daily routines and environments. What are these examples of, respectively?

A) loss of short, retention of long-term memory
B) loss of short-term, retention of long-term memory
C) loss of long-term, retention of explicit memory
D) loss of implicit memory, retention of short-term memory