Recent Research Comparing Male and Female Physicians' Care of Female

Recent research comparing male and female physicians' care of female patients shows that

A) male physicians are more cautious than female physicians in that they order on average significantly more tests, such as mammograms and pap smears.
B) female physicians tend to care for female patients better than male physicians do.
C) male physicians are favored by female patients.
D) there is no difference between male and female physicians in the care they give to female patients.