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: Pathology
Thrombocytosis is a recognised feature of ? 
Select and explain. 
A. Myelofibrosis, B. Systemic lupus erythematosis, C. Azidothymidine therapy, D. All
A: Myelofibrosis
Answer: A: Myelofibrosis 
Explanation: Ans. is 'a' i.e., Myelofibrosis Impoant causes of thrombocytosis o Collegen vascular disease o Infection o Hemorrhage o Inflammatory bowel disease o Myeloproliferative disorders o Iron deficiency anemia o Malignancy o Myelodysplastic syndrome