Task: Explanation
Input (English): Ricardo “El Finito” López Nava (born July 25, 1966) is a retired undefeated Mexican professional boxer. As a professional, he defended the Lineal and WBC Strawweight Championship a record 21 times. He also won the WBA and WBO Championships in the same weight class. López later won the IBF Light Flyweight Championship and defended it twice before retiring. He is also the father of undefeated flyweight prospect Alonso López. Question: The father of Alonso López defended what title twice before retiring? Answer: IBF Light Flyweight Championship
Output (English):  López later won the IBF Light Flyweight Championship and defended it twice before retiring.