Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
Q: Context: Past presidents of PEN International have included Alberto Moravia, Heinrich Boll, Arthur Miller, Mario Vargas Llosa, Homero Aridjis, Jiri Grusa and John Ralston Saul.
Question: Who led PEN International?
A:
john ralston saul