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: Medicine
Primary Pulmonary T.B, true about -a) Cavitary lesionb) Pleural effusionc) Fibrocaseous lesiond) Phlyctenular keratitis 
Select and explain. 
A. abc, B. acd, C. bcd, D. bd
C: bcd
Answer: C: bcd 
Explanation: None