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: Anatomy
[{'content': 'Which of the following is associated with highest risk of anaphylaxis \nSelect and explain. \nA. Iron dextran, B. Iron sucrose, C. Ferumoxytol, D. Iron gluconate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Harrison 19 th ed pg 629 intravenous iron dextran, anaphylaxis is a con- cern. Anaphylaxis is much rarer with the newer preparations. The factors that have correlated with an anaphylactic-like reaction include a history of multiple allergies or a prior allergic reaction to dextran (in the case of iron dextran)', 'role': 'assistant'}]