This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous Questions, Subject name: Medicine
[{'content': '46 year old female presented to OPD with complaints of breathlessness, purulent copious cough for 6 weeks. She lost 6 kg in 1.5 months. She was put on Clarithromycin and prednisolone for 2 weeks but there was no improvement in her condition . Chest Xray demonstrated persistent consolidation in the left lower lobe. What is the probable diagnosis of this patient? \nSelect and explain. \nA. Adenocarcinoma in situ, B. Atypical pneumonia, C. Mesothelioma, D. Organising pneumonia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: From the h/o purulent productive cough , loss of weight , and imaging study demonstrating consolidation in lung , adenocarcinoma in situ is a possibility and should be actively excluded by obtaining histology. Adenocarcinoma- seen in females & non smokers On CT scan , AIS is a nonsolid nodule On h/p, AIS shows lepidic growth with <=5 mm invasion 5-year disease-free survival = 100% , if complete tumor is resected', 'role': 'assistant'}]