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: Radiology
A 3 year old female child developed fever, cough and respiratory distress. On the chest, X-ray consolidation is seen in right lower lobe. She improved with antibiotics but on follow up at 8 weeks was again found to have increasing consolidation in right lower lobe. Your next investigation would be – 
Select and explain. 
A. Bronchoscopy, B. Bacterial culture of the nasopharynx, C. CT scan of the chest, D. Allergen sensitivity test
C: CT scan of the chest
Answer: C: CT scan of the chest 
Explanation: "Plain chest radiography is the mainstay in diagnosis and monitoring progress of pneumonia. CT is used when complications are suspected".