The word "adamantly" (in boldface) is closest in meaning to ______.

A．It aims to look at the problem from a different perspective.
B．The experiment result shows the contrary to the argument.
C．The experiment result gives a support to the argument.
D．It aims to provide an alternative solution to the problem.

A．even the patients doubt the antibiotic treatment
B．doxycycline has been regarded as the most effective
C．doctors disagree as to the effect of strong antibiotics
D．moderate antibiotics are better than intensive ones