What is the test for reviewability of a decision by an administrative tribunal on a question of credibility?

Canada (Federal), Canada

The following excerpt is from Arambulo Ruiz v. Canada (Citizenship and Immigration), 2009 FC 903 (CanLII):

Pursuant to Dunsmuir v. New Brunswick, 2008 SCC 9, the decisions of administrative tribunals on questions of fact are reviewable according to the standard of reasonableness. Credibility is a question of fact. FACTS ALLEGED BY APPLICANTS

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