Question: Who is Diosdado Macapagal Arroyo's maternal grandfather?
Sentence (from "Gloria Macapagal Arroyo"): Maria Gloria Macaraeg Macapagal-Arroyo (born April 5, 1947) is a Filipino academic and former politician who was the 14th President of the Philippines from 2001 until 2010.
Relevant evidence: No