Question: What is the date of birth of Bertha Hernández Fernández's husband?
Sentence (from "Bertha Hernández Fernández"): Bertha Hernández Fernández (17 April 1907 – 11 September 1993) was the wife of the 17th President of Colombia, Mariano Ospina Pérez, and served as First Lady of Colombia from 1946 to 1950.
Relevant evidence: Yes