It’s no joke being stuck in a hospital bed. But it seems that the old adage is true — laughter really is the best medicine. The researcher found that it is likely to put you on the road to recovery more quickly than any hi-tech treatment, simply by increasing your circulation. Traditional nursing care is also effective and this human contact is likely to lead to jokes and banter which is where the laughter therapy comes in. The research, published by the British Medical Journal, said: "Forget technology. The best prescription for patients with venous leg ulcers (下肢静脉溃疡患者) is good quality nursing care and the occasional belly laugh !" Previous studies have shown that laughter can ward off heart disease. Loma Linda University in California studied men and women taking medication for diabetes, high blood pressure and high cholesterol. Those who were prescribed "mirthful laughter" in the form of 30 minutes of comedy every day found their stress hormone (肾上腺素) levels fell. Which of the following is true
A．Those who watch comedy found their stress hormone levels rise. B．Traditional nursing care is also effective. C．Good quality nursing care and the occasional belly laugh are useless. D．It’s a wonderful thing to be stuck in a hospital bed.