Coffee and tea contain methylxanthines, which cause temporary increases in the natural production of vasopressin, a hormone produced by the pituitary gland. Vasopressin causes clumping of blood cells, and the clumping is more pronounced in women than in men. This is probably the explanation of the fact that women face as much as a tenfold higher risk than men do of complications following angioplasty, a technique used to clear clogged arteries. Which one of the following statements is most strongly supported by the information above? ['Men, but not women, should be given methylxanthines prior to undergoing angioplasty.', 'Prior to undergoing angioplasty, women should avoid coffee and tea.', 'Angioplasty should not be used to treat clogged arteries.', 'In spite of the risks, angioplasty is the only effective treatment for clogged arteries.']