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: Pharmacology
Which of the following drug is used for the treatment of sickle cell anemia ? 
Select and explain. 
A. Hydroxyurea, B. Cisplatin, C. Paclitaxel, D. Carboplatin
A: Hydroxyurea
Answer: A: Hydroxyurea 
Explanation: None