35. Choice a right description about morphine treatment of cancer pain.
(A) Nausea is a common mild side effect with strong opioid but no early prevention needed.
(B) Sedation and mild confusion may happen and they are usually not self-limiting.
(C) Respiratory depression should not be the reason for avoiding using morphine.
(D) Morphine resistance seldom happens and no consideration was needed for clinical practice.
(E) None of above is right.