The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

You make a meal to take to work and then you forget it. Has this ever happened to you? Or you see someone you know well but you cannot remember his name. Researchers of A lzheimer's said they now have proof that self-reported minor memory loss sometimes led to greater mental problems six years later.
Memory （） may be an early sign of Alzheimer's.