This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': 'Sideroblastic anemia is caused by all except - \nSelect and explain. \nA. Collegen vascular disease, B. Iron deficit, C. Lead poisoning, D. Cutaneous porphyria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This is a refractory anaemia defined by the presence of many pathological ring sideroblasts in the bone marrow.These are abnormal erythroblasts containing numerous iron granules arranged in a ring or collar around the nucleus.Sideroblastic anaemia is diagnosed when 15% or more of marrow erythroblasts are ring sideroblasts.sideroblatic anemia iron containing inclusions are seen in RBCs . Here serum iron concention is seen to be markedly increased. Reference : Hoffbrand Hematology, 6th edition, pg 47. Exam preparatory manual for UGs by Ramdas Nayak Page no: 283', 'role': 'assistant'}]