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In a recent survey report it has been stated that those who undertake physical exercise for at least half an hour a day are less prone to have any heart ailments. Which of the following contradicts the above statements?

A)  Less than ten per cent of the heart patients do not undertake any physical exercise

B)  Physical exercise increases the agility of heart

C)  Physical exercise decreases the possibility of developing blocks in the arteries

D)  People doing only desk work are more susceptible to heart ailment