This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pulmonary Tuberculosis and Lung Abscess, Subject name: Pathology
In primary tuberculosis, all of the following may be seen except: 
Select and explain. 
A. Cavitation, B. Caseation, C. Calcification, D. Langhans giant cell
A: Cavitation
Answer: A: Cavitation 
Explanation: Cavitation is seen when there has been a previous sensitization of the host resulting in caseous necrotic material being present which is discharged through the cavities. So, it is associated with secondary tuberculosis more frequently.