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
Hemoptysis is seen in what propoion of the post primary(adult type) tuberculosis? 
Select and explain. 
A. 10-20%, B. 20-30%, C. 30-40%, D. 40-50%
B: 20-30%
Answer: B: 20-30% 
Explanation: Hemoptysis develops in 20-30% of cases, and massive hemoptysis due to erosion of a blood vessel in the wall of a cavity. May also result from rupture of a dilated vessel in a cavity (Rasmussen's aneurysm) or from aspergilloma formation in an old cavity. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 1345