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After the Russian doping scandal, all of China's athletes, coaches and training doctors have been made to take a written exam on banned substances ahead of the Olympics in Rio de Janeiro as part of the country's zero-tolerance stance on doping. One man hoping to make his mark in Rio is Alex Hua Tian - China's only equestrian rider competing at the Games. He told the Â鶹Éç's Andrew Lindsay exactly what the test involved. Picture: China flag. Credit: Getty Images