Premise: Then, too, there have been the campaigners who have gone to what some regard as opposite  if the head of a committee is known to be a man or a woman, then chairman or chairwoman must surely be the proper denotation; if the sex of the person is not known, then chairperson , though awkward-sounding, is the preferred form.

Hypothesis: The gender of the person in question will determine the proper denotation.
Relation: entailment