Given a short bio of a person, find the minimal text span containing the date of birth of the person. The output must be the minimal text span that contains the birth date, month and year as long as they are present. For instance, given a bio like 'I was born on 27th of Decemeber 1990, and graduated high school on 23rd October 2008.' the output should be '27th of December 1990'.

Q: Cara Jocelyn Delevingne was born on 12 August 1992, in Hammersmith, London, the daughter of Pandora Anne Delevigne (née Stevens) and property developer Charles Hamar Delevingne

A: 12 August 1992
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Q: Yelchin was born on March 11, 1989, in Leningrad, Russian SFSR, Soviet Union (now Saint Petersburg, Russia)

A: March 11, 1989
****
Q: Leonardo Wilhelm DiCaprio was born on November 11, 1974, in Los Angeles, California, the only child of Irmelin (née Indenbirken), a legal secretary, and George DiCaprio, an underground comix writer, publisher, and distributor of comic books

A:
November 11, 1974
****
