<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _monomers(self):
 """Calls the appropriate monomers method based on policies."""

        for stmt in self.statements:
            if _is_whitelisted(stmt):
                self._dispatch(stmt, 'monomers', self.agent_set)