According to the Text,alcohol Is "The Sharpest Double-Edged Sword in Medicine

According to the text,alcohol is "the sharpest double-edged sword in medicine" because __________.

A) moderate forms of alcohol are beneficial for men but not women
B) moderate forms of only certain types of alcohol can be beneficial and most of the public do not know which forms are beneficial and which are not
C) moderate forms of alcohol only show medical benefits for older people
D) moderate forms of alcohol can save your life,but immoderate amounts can destroy it