Which of the following statements is NOT true?A.Doctors know more about chronotherapeutics

Which of the following statements is NOT true？

A．Doctors know more about chronotherapeutics than before.

B．Doctors in the U. S. used to be thirsty to know more about the new medical field.

C．The researchers" insights are providing new strategies to prevent common killers.

D．The strategic use of time in medicine attracts more attention in the medical circle in the U.S.

请帮忙给出正确答案和分析，谢谢！