​Research on the medical benefits of qi gong indicates that

A) ​qi gong practice creates measurable changes in electric and thermal energy.
B) ​qi gong must be combined with tai chi to exert beneficial effects.
C) ​the benefits are similar to relaxation training, producing mostly stress reduction.
D) ​the benefits from qi gong are similar to the effects from placebos.

Qi Gong

A centuries-old system of coordinated body-posture and movement, breathing, and meditation used for the purposes of health, spirituality, and martial-arts training.

Stress Reduction

The process of decreasing the level of stress that an individual experiences, often through techniques like deep breathing, meditation, or exercise.

Thermal Energy

The internal energy contained within a system that is responsible for its temperature.