This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Newer inclusion in 2015 WHO classification of squamous cell carcinoma of lung include(s) \nSelect and explain. \nA. Clear cell variant, B. Papillary cell variant, C. Adenocarcinoma variant, D. Nonkeratinizing variant', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer- D, Nonkeratinizing variantOld classification-PapillaryClear cellSmall cellBasaloidNewer Classification-Keratinizing SCCNonkeratinizing SCCBasaloid SCCPreinvasive: SCC in situ', 'role': 'assistant'}]