This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Positron emission tomographic (PET) scanning is useful in evaluation of the following except NOT RELATED-RADIOLOGY \nSelect and explain. \nA. Mycotic aoic aneurysm, B. Solitary pulmonary nodules, C. Staging lung cancer, D. Lymph node involvement by malignancy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]