This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
Eltrombopag is a: 
Select and explain. 
A. Thrombopoietin agonist, B. Thrombopoietin antagonist, C. Erythropoietin agonist, D. Erythropoietin antagonist
A: Thrombopoietin agonist
Answer: A: Thrombopoietin agonist 
Explanation: Eltrombopag is a oral thrombopoetin agonist, it increases the no. of platelets. So, it is approved for Idiopathic Thrombocytopenic Purpura(ITP). Some other such drugs are approved like: Lusutrombopag is used for patients having liver disease. Romilostim is intravenous thrombopoetin agonist. Erythropoetin agonist is Darbopoetin used in chronic renal faiure induced anemia and bone marrow suppresson induced anemia.