human
Solve the following python programming problem given the following code:
def default_value_getter(field) : 
    "
    When accessing to the name of the field itself, the value
    in the current language will be returned. Unless it's set,
    the value in the default language will be returned.
    " 
    def default_value_func_getter(self) : 
        localized_field = utils.build_localized_field_name (field, self._linguist.active_language) 
        value = getattr (self, localized_field) 
        if value : 
            return value 
default_field = utils.build_localized_field_name (field, self.default_language) 
        return getattr (self, default_field) 
return <MASK> 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: field
assistant
#Here is a proper replacement for <MASK>.
def default_value_func_getter(