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
Sideroblastic anemia is caused by all except ? 
Select and explain. 
A. Collegen vascular disease, B. Iron deficit, C. Lead poisoning, D. Cutaneous porphyria
B: Iron deficit
Answer: B: Iron deficit 
Explanation: Ans. is 'b' i.e., Iron deficit Causes of sideroblastic anemia Hereditary o X-linked recessive sideroblastic anemia. Acquired Hematological Drugs & chemicals Others Myelofibrosis INH RA Myelodysplasia Penicillamine Myxedema Acute leukemia Lead SLE Lymphoma Alcohol Iron overload Myeloma Pyridoxin dificiency Porphyria Polycythemia vera Chloromphenicol Hemolytic anemia