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': 'Which of the following is not true about Bronchoalveolar carcinoma - \nSelect and explain. \nA. Adenocarcinoma, B. Stromal invasion with desmoplasia, C. Preservation of alveolar structure, D. Grows along pre-existing anatomical structures', 'role': 'user'}, {'content': 'Answer: B \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. it is a type of adenocarcinoma.Thre is preservation of alveolar structure and grows along pre-existing anatomical structures.', 'role': 'assistant'}]