## 12. Doctors and Their Wives

Once, three doctors gathered with their spouses. One of them was a general practitioner, another was a psychiatrist, and the third was an ophthalmologist. Madame Dubois, a rather large woman, was as much taller than the general practitioner as he was taller than his wife. The woman whose height was closest to that of the general practitioner weighed as much as he did, while Madame Deschamps weighed 10 kg less. As for Dr. Duchemin, he weighed 20 kg more than the ophthalmologist.

What is the surname of the psychiatrist?
12. Madame Dubois and the therapist's wife are equally different in height from the therapist. Therefore, the woman whose height is closest to the therapist's cannot be either Madame Dubois or Madame Deschamps (who weighs 10 kg less); thus, this woman is Madame Duchemin. Therefore, the therapist's wife could only be Madame Deschamps, and the therapist is Dr. Deschamps. Dr. Duchemin is not the ophthalmologist (since he weighs 20 kg more than the latter); therefore, he is the psychiatrist.