int PndTutAnaTask::SelectTruePid(PndAnalysis *ana, RhoCandList &l) {
	int removed = 0;
	for (int ii=l.GetLength()-1;ii>=0;--ii) {
		if ( !(ana->McTruthMatch(l[ii])) ) {
			l.Remove(l[ii]);
			removed++;
		}
	}
	return removed;
}