11. About chemical neurolytic nerve blocks, which one of following statements is wrong?
(A) Phenol or ethanol is usually used for chemical denervation.
(B) The duration of these blocks is often disappointingly brief.
(C) They may induce deafferentation-neuropathic type pain.
(D) They are often indicated for patients with chronic pain and a normal life expectancy.
(E) They can be used in patients with advanced cancer disease.
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