In "The Scarlet Letter," what important question related to Hester's crime is still unanswered?

The most
important unanswered question in 's community is the identity of the baby's father. The
adulteress is known (and branded with the scarlet "A"), but who is the
adulterer?

However, while this may be the most obvious question that
remains,also poses others.  Hawthorne, for instance, opens up the whole nature of sin and
sinners--Hester may wear the letter that marks her as a criminal, but Hawthorne shows us that
the issue of sin is not so easily defined. Hester, despite her adultery, is ultimately a figure
to be admired. In this way, the meaning of the "A" is also unanswered, to some
extent.  Throughout the novel, Hawthorne repeatedly shows us the different meanings of Hester's
mark, many of which are positive.