Question:
Who was the chair of Roman Catholic Diocese of Edmundston in May, 1987?

Context:
 Joseph-Roméo Gagnon is the chair of Roman Catholic Diocese of Edmundston from Feb, 1949 to Feb, 1970. 
 Gérard Dionne is the chair of Roman Catholic Diocese of Edmundston from Nov, 1983 to Oct, 1993. 
 François Thibodeau is the chair of Roman Catholic Diocese of Edmundston from Oct, 1993 to Jan, 2009. 
 Fernand Lacroix is the chair of Roman Catholic Diocese of Edmundston from Aug, 1970 to May, 1983. 
 Marie-Antoine Roy is the chair of Roman Catholic Diocese of Edmundston from May, 1945 to Oct, 1948.

Answer:
Gérard Dionne