47.A 58-year-old man with a history of asbestos exposure presents with progressive dyspnea and chest n ing reveale diffse nleural thickeni pain. Imaging reveals diffuse pleural thickening and a mass encasing the lung. Histology shows mass encasine the lung Histolooy she maianantcelle formind hular and nanillar strictres with immunobistochemistry nositive fo malignant cells forming tubular and papillary structures, with immunohistochemistry positive for calratinin and WT1 Which of the following is the most likely diagnoeis? calretinin and WT-1. Which of the following is the most likely diagnosis?

(A) Primary pulmonary adenocarcinoma

(B) Metastatic gastrointestinal adenocarcinoma to the lung

(C) Malignant mesothelioma

(D) Squamous cell carcinoma of the lung