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
A 40 year old male patient is hospitalised with huge splenomegaly, marked sternal tenderness, and a total leucocyte count of 85,000 per cubic millimetre with large percentage of myeocytes and meta myelocytes, which one of the following drugs is best indicated for his disease ? 
Select and explain. 
A. Cyclophosphamide, B. Chlorambucil, C. Melphation, D. Hydroxyurea
D: Hydroxyurea
Answer: D: Hydroxyurea 
Explanation: None