This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
[{'content': 'What is function of Intrinsic Factor? \nSelect and explain. \nA. Increases cobalamin absorption, B. Increases folate absorption, C. Conves prothrombin to thrombin, D. Conve s fibrinogen to fibrin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vit B12 synonyms are cobalamine, extrinsic factor of castle, anti-pernicious anaemia factor parietal cells of the stomach secrete a special protein called intrinsic factor (IF). IF is required for the absorption of Vit B12 one molecule of IF can combine with 2 molecules of B12 this complex attaches to specific receptors on mucosal cells and get internalised ref DM Vasudevan 8thed page 477', 'role': 'assistant'}]