This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Category II treatment - 
Select and explain. 
A. 2HRZES, B. 1 HRZE, C. 5 HRE, D. All
D: All
Answer: D: All 
Explanation: Previously treated or category 2 includes combination of all the above drugs