{{i}}quEstions 22 ～ 25 ArE BAsED on thE Following monologuE on smoking.{{/i}}

whiCh suBstAnCE in CigArEttE CAusEs CAnCErA．CigArEttE AshEs.
B．niCotinE.
C．tAr.
D．not mEntionED hErE.