The most common site and type of metaplasia are :: (A) Respiratory tract epithelium, Columnar metaplasia, (B) Respiratory tract epithelium, Squeamous metaplasia, (C) Esophagus, Squeamous metaplasia, (D) Esophagus, Columnar metaplasia
Answer is B. As respiratory tract is exposed to chronic irritation due to dust, Smoke etc, it undergoes squeamous metaplasia ,