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
Interferon is used in - a) CML  b) Multiple myeloma  c) Small cell Ca of lung   d) Non small cell Ca of lung  e) Renal cell Ca 
Select and explain. 
A. abe, B. acd, C. ab, D. cd
A: abe
Answer: A: abe 
Explanation: None