This comes from my brother Paul in Ann Arbor. The dialog reveals a logic problem. Can you solve it?

CasparEtt: got a good loginc problem for your kids

CasparEtt: are you interested

ncmathsadist: sure, show the problem

ncmathsadist: I will inflict it on my discreteG class

CasparEtt: A woman and her husband hosted a party for four other couples. The hostess asked everyone to shake hands and introduce themselves to each other. Of course, no one shook hands with his or her spouse. At some point, the hostess stopped them and asked each person how many hands he or she had shaken. Each person gave a different response. What was the response of her husband?