<prompt> Buccolingual positioning of mandibular Canal can be assessed by:Horizontal 0 and -20 degree.Horizontal 0 and -15 degree.Vertical 0 and -20 degree.Vertical 0 and -15 degree.  <response>: Periapical radiographs taken from two vertical angulations, 0 parallel technique and Minus 20, determine the buccolingual position of the canal.Periapical radiographs taken from two Horizontal angulations, 0 parallel technique and Minus 20, may differentiate between buccal and lingual roots. 