Select the tople sentence,
"What is amnesia? Most of us think of a dramatie, total loss of memory brought on by a severe blow to the
head. "Amnesla is, however, a very subtle, and sometimes sinister, illness. While amnesia can result from a
head injury, overwork and worry can also lead to memory lapses in some cases, diagnosis is difficult
because these lapses are intermittent, rather than constant