A．In the past, Alzheimer’s disease has often been mistaken as normal human aging
B．Victims of Alzheimer’s disease rarely need to be institutionalized.
C．There is currently no cure for Alzheimer’s disease.
D．The primary symptoms are serious forgetfulness and confusion.

A．there are many controversial issues like the right amount of sleep
B．among many issues the right amount of sleep is the least controversial
C．people are now moving towards solving many controversial issues
D．the right amount of sleep is a topic of much controversy among doctors