This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'what is the anticoagulant of choice in electrolyte estimation ? \nSelect and explain. \nA. lithium heparin, B. trisodium citrate, C. EDTA, D. all of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Anticoagulant) : * Is a substance that prevents blood from coagulation or clotting. * The most common anticoagulants used in hematology are: 1. EDTA: Ethylen Diamine Tetraacetic acid -CBC , RBC MORPHOLOGY 2. Sodium citrate - FOR COAGULATION STUDIES 3. Heparine -ABG (ELECTROLYTES), IMMUNOPHENOTYPING ,LEUKOCYTE FUNCTION DEFECT , OSMOTIC FRAGILITY TEST REF : ROBBINS 10TH ED', 'role': 'assistant'}]