However, I don't identify well the problem in A.
If someone could help me.
Let me try..
Beside that A is wordy, I think the original intent of the text is that the number of female students currently enrolled in medical schools
is the same as the number of male students currently enrolled in medical schools
Option A misses "currently enrolled in medical schools" for female medical students. It compares female medical students (in whole) with male medical students currently enrolled....
But option B corrects this ambiguity.
Let me know if i am wrong