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 25 year old lady on treatment for rheumatoid ahritis has following lab findings: Hb-9gm/dl, MCV- 55fl, serum iron-30microgm/d1, ferritin 200 ng/ml, TIBC- 298 micrograms/dl. What is the most probable diagnosis? 
Select and explain. 
A. Thalassemia minor, B. Thalassemia major, C. Anemia of chronic disease, D. Iron deficiency anemia
C: Anemia of chronic disease
Answer: C: Anemia of chronic disease 
Explanation: Answer C. Anemia of chronic diseaseE aicular manifestations of Rheumatoid Ahritis:* Subcutaneous nodules * Sjogren's syndrome* Pericarditis, Mitral regurgitation * Pleuritis, Interstitial Lung disease * Vasculitis * Felty's syndrome in the late stages of RA ; most common hematologic abnormality in RA- normochromic normocytic anemia.* Lymphoma