Question: What was the birth year of the son of Charles Frederick Menninger who died in 1990?
Sentence (from "Karl Menninger"): Karl Augustus Menninger (July 22, 1893 – July 18, 1990) was an American psychiatrist and a member of the Menninger family of psychiatrists who founded the Menninger Foundation and the Menninger Clinic in Topeka, Kansas.
Relevant evidence: Yes