Questions 49-52 are based on the following passage.

    In addition to being pleasant and reducing thirst, drinking tea turns out to be also beneficial for health. Some research results show that drinking tea is beneficial for health if the amount of tea consumed is not excessive.

    Female First writes that a new study in the United Ktngdom shows that drinking tea regularly can help reduce the risk of developing breast cancer. To analyze the relationship between tea consumption and the reduces risk of breast cancer, researchers conducted 9 studies of the benefits of tea consumption in 13,204 breast cancer patients. Based on the results of these studies, antioxidant properties in tea can help reduce the risk of breast cancer. Taking tea regularly causes a 21% reduction in breast cancer risk. According to a female health specialist, Dr. Catherine Hood from "The Tea Advisory Panel (TAP)" to Female First, this finding is related to the level of polyphenols in tea. Tea is rich in polyphenols, including catechins and gallocathins, which have been known to function as antioxidants and to have anti-tumor effects.

    The latest research conducted by Dr. Tim Bond from The Tea Advisory Panel (TAP) shows that consuming black tea lowers cardiovascular risks. Flavonoid in tea helps improve blood vessel functions. In this study, 20 healthy people consumed tea three times a day for one week. The results show that the blood vessel function of these people increases after consuming tea that is not brewed with hot water.

    According to the Daily Mail, scientist from Taiwan reported that consuming three cups of tea a day helps prevent heart disease and improves blood circulation. Drinking more than 450 ml of tea every day will reduce the risk of arteries becoming stiff, with a reduced risk of 22%. Research conducted by the Harvard School of Public Health, America, also shows that tea has many health benefits. Besides being able to lower blood pressure, tea can also help prevent the ovaries and digestive system cancer. Consuming three cups of black tea or green tea every day can help prevent strokes. Drinking green tea, in particular, can help reduce the risk of breast, prostate, and endometrial cancer.

(Adapted from: www.surienez.com)

Why does the author argue that drinking tea can reduce the risk of heart disease?