According to the Joint Commission,which of These Statements About Pain

According to The Joint Commission,which of these statements about pain and its management is TRUE?

A) Clients are assumed to experience some degree of pain at all times.
B) Staff must take special courses to be competent in pain management.
C) Pain assessment is considered to be the "fifth" vital sign.
D) There must be evidence that the least expensive,most effective pain medications are used.