premise: Club Deportivo Cajamadrid was a professional basketball and handball team in Spain. It was founded in 1979 and the basketball team played in Liga ACB from 1983 to 1986. The club was sponsored by Caja Madrid until 1991, when the bank decided to retire its support and continued as a different club called Juventud Alcalá.
hypothesis: caja madrid started sponshorship of Club Deportivo Cajamadrid in 1979.
reason: Club Deportivo Cajamadrid was founded in 1979.  The club was sponsored by Caja Madrid until 1991.  System missed beccause it does not definitely state started sponsorship in 1979 but says it was sponsored until 1991 by Caja Madrid.