Question:
Which employer did Pedro J. Ramírez work for in Dec, 1997?

Context:
 Pedro J. Ramírez works for El Español from Jan, 2015 to Dec, 2022. 
 Pedro J. Ramírez works for El Mundo. from Oct, 1989 to Feb, 2014. 
 Pedro J. Ramírez works for Diario 16 from Jun, 1980 to Mar, 1989. 
 Pedro J. Ramírez works for ABC from Jan, 1975 to Jan, 1980.

Answer:
El Mundo.