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: Medicine
[{'content': 'Megaloblastic anaemia due to folic acid deficiency is commonly due to - \nSelect and explain. \nA. Inadequate dietary intake, B. Defective intestinal absorption, C. Absence of folic acid binding protein in serum, D. Absence of glutamic acid in the Intestine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <p>Most dietary folate is present as polyglutamates;these are conveed to monoglutamate in the upper small intestine & actively transpoed into plasma.Plasma folate is loosely bound to plasma proteins such as proteins such as albumin & there is an enterohepatic circulation.Total body stores of folate are small & deficiency can occur in a matter of weeks</p><p>Serum folate is very insensitive to dietary intake; a single meal can normalise it in a patient with true folate deficiency.</p><p>Reference :Davidson&;s Principles & Practice of Medicine 22nd edition pg no1025</p>', 'role': 'assistant'}]