The following are multiple choice questions (with answers) about medical knowledge.   **Question:** An investigator is studying the cell morphologies of the respiratory tract. He obtains a biopsy from the mainstem bronchus of a patient. On microscopic examination, the biopsy sample shows uniform squamous cells in layers. Which of the following best describes the histologic finding seen in this patient?   (A) Metaplasia   (B) Normal epithelium   (C) Dysplasia   (D) Anaplasia "
['(A) Metaplasia <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Metaplasia \n (B) Normal epithelium \n (C) Dysplasia \n (D) Anaplasia\n" <> possible answers', '  An investigator is studying the cell morphologies of the respiratory tract. He obtains a biopsy from the mainstem bronchus of a patient. On microscopic examination, the biopsy sample shows uniform squamous cells in layers. Which of the following best describes the histologic finding seen in this patient? <> context@']