According to the passage, which of the following is true but not directly mentioned
A． Christopher Reeve's fame as a former movie star and experience of the riding accident will help persuade the public of the advantages of stem cell research~
B． Paul Berg of Stanford University is a Nobel Prize laureate, and as an expert of this field, he is firmly against the Brownback bill.
C． Advocates of stem cell research come from different professions, including former movie stars and prominent scientists.
D． The Brownback bill will have a total ban on stem cell research, but will permit the importing of such technologies from countries like UK for the treatment of US citizens.