Which sentence best shows the central idea of the excerpt?
O "Elizabethans do not understand infection and
contagion as we do."
O "It is not that they are completely ignorant as to how
illnesses spread—physicians believe they know
perfectly wellit is rather that their understanding is
very different from ours."
O "The principal ideas underpinning most Elizabethan
medical thinking come from Galen, who lived in the
second century A. D."
O "If there is too much choler in your body, you will grow
choleric; too much blood and you will be sanguine, too
much phlegm and you will be phlegmatic; and too
much black bile makes you melancholic."