Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

In 1988, Canadian athlete Ben Johnson set a new world record for the 100 metres sprint and set the Seoul Olympics alight. Just a few days later, he was stripped of his medal and banned from competing after having failed a drug test, highlighting what has since become an international problem - drug use in sport.

Those involved in sports face enormous pressure to excel in competition, all the more so as their careers are relatively short. By the time most sportspeople are in their forties, they are already considered to be past their prime, and as a result they need to earn their money as quickly as possible. In such a high-pressure environment, success has to come quickly and increasingly often drugs are playing a prominent role.

There are a number of specific effects that sportspeople are aiming to achieve by taking performance- enhancing drugs. Caffeine and cocaine are commonly used as stimulants, getting the body ready for the mass expenditure of energy required. In addition, there are those who are looking to build their body strength and turn to the use of anabolic steroids. Having worked so hard and needing to unwind, sportspeople may misuse other drugs as a relaxant in that it can help them cope with stress or boost their own confidence. Alcohol is commonly used for this purpose, but for sportspeople something more direct is often required, and this has led to an increase in the use of beta-blockers specifically to steady nerves.

The text is mainly about                .