yp i knw ... bt students do choose the area of research, i mean domain bfore choosing supervisor ...
yes, but the domain in most cases is pretty broad... in most cases, the student is able to align him/herself with a supervisor within a specific area of research within the subject domain... but even this doesn't mean that the actual research problem and style of research will appeal to the student. You'll need to reach a compromise... that's the only way to ensure sustained scholarship funding for the duration of your studies.