Which of the altered states discussed in your text has been well established as an effective mild anesthetic treatment for both acute and chronic pain

A)  circadian rhythms
B)  antipsychotics 
C)  sleep
D)  hypnosis

Mild Anesthetic

A substance that induces a reversible loss of sensation or pain, used in minor surgical or medical procedures.

Altered States

Conditions of consciousness that significantly differ from one's normal waking state, which can be achieved through meditation, drugs, hypnosis, or other methods.

Effective Treatment

A therapeutic intervention or approach that has been scientifically tested and proven to work in improving or curing a condition or disease.