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
Romiplostim acts on which of the following receptors: 
Select and explain. 
A. Thrombopoeitin, B. IL 6, C. IL 8, D. PGE 1
A: Thrombopoeitin
Answer: A: Thrombopoeitin 
Explanation: Romiplostim: Genetically engineered protein in which the Fc component of a human antibody is fused to two copies of a peptide that stimulates the thrombopoietin receptors; approved for treatment of idiopathic thrombocytopenic purpura Ref: Katzung 11th edition Chapter 33.