A 62-year-old man with a 40-year smoking history presents to the emergency department with hemoptysis, chest pain, and progressive dyspnea over 3 weeks. He reports unintentional weight loss of 8 kg over 2 months. Vital signs reveal BP 138/82 mmHg, HR 102/min, RR 22/min. Chest X-ray shows a 3-cm central hilar mass with mediastinal widening. Bronchoscopy reveals an endobronchial lesion, and tissue biopsy demonstrates sheets of cells with scant cytoplasm, round to oval hyperchromatic nuclei with "molded" appearance, numerous mitotic figures, and extensive necrosis. Immunohistochemistry is positive for chromogranin A and synaptophysin. Which of the following best describes the histologic classification and key pathologic features of this malignancy?

1. A)Small cell lung carcinoma with neuroendocrine differentiationGABARITO
2. B)Squamous cell carcinoma with central keratinization and intercellular bridges
3. C)Large cell neuroendocrine carcinoma with Ki-67 >30%
4. D)Adenocarcinoma with bronchioloalveolar pattern and mucin production
5. E)Typical pulmonary carcinoid (neuroendocrine tumor) with low mitotic rate