Rule part 61.39 on Biennial flight review states the following, pretty clear cut really.
(b) The holder of a pilot licence issued in accordance with this Part is not
required to complete a biennial flight review required by paragraph (a) if the
holder—
(1) meets the applicable flight crew competency check requirements
prescribed in Parts 119 and 121, 125 or 135; or
(2) meets the agricultural currency requirements prescribed in rule
61.707; or
(3) holds a current Category A, B, or C flight instructor rating.