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: Pathology
[{'content': 'In primary tuberculosis, all of the following may be seen except - \nSelect and explain. \nA. Cavitation, B. Caseation, C. Calcification, D. Giant cell', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tuberculosis \n\nDepending on the time of infection and the type of response pulmonary tuberculosis may be classified as primary and post-primary.\nPrimary tuberculosis is the initial infection by tubercle bacilli in a host.\nPost-primary (secondary or adult) type of tuberculosis is due to reactivation of latent infection or exogenous reinfection.', 'role': 'assistant'}]