This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pathology
[{'content': 'Bronchoalveolar carcinoma variants are - \nSelect and explain. \nA. Clara cell, B. Adenosarcoma, C. Mucinous type, D. Type II pneumocyte', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref:Textbook of pathology (Harsh mohan) 6th edition,page no. 501 Bronchiolo-alveolar carcinoma is characterised by cuboidal to tall columnar and mucus-secreting epithelial cells growing along the existing alveoli and forming numerous papillary structures. Ultrastructurally, these tumour cells resemble Clara cells or less often type II pneumocytes.', 'role': 'assistant'}]