With the current mood of global uncertainty and an economic recession, people are likely to suffer from increased stress, depression and anxiety. These psychological symptoms, in a new twist to the old saying of "mind over matter", can lead to actual physical problems. The mind and the body are integrated system. It’s like a web. If one part is disturbed, it will directly, or indirectly, affect another part. Hence, psychological and emotional reactions will trigger physical responses. When a person feels a threat to his well-being, the brain reacts by releasing chemicals. For example, the adrenal gland in the brain may release adrenaline(肾上腺素) which prepares the body to respond to physical threats. The brain’s neuro-chemistry programs a person to react in one of the classic ways: fight, flight or fright. Are you sleeping well Are you eating well Are you working or studying well Any mental health problem would affect these three areas of behavior. Some people deal with stress and anxiety by turning to religion, others by talking to friends and family. But there are other options. Exercise is a good outlet. Play a game. Go jogging. You will be concentrating on doing something. There is a target to be achieved and will occupy your mind. Go Karaoke singing and dancing with friends. The worst thing to do is to sit at home and think.What does "mind over matter" in the first paragraph mean（） A. Mind is better than matter. B. Never lose your mind. C. Mind is more important. D. Think before you act.