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': 'Which of the following is not the cause of macrocytic anaemia ?- \nSelect and explain. \nA. Orotic aciduria, B. Abetalipoproteinemia, C. Lesh nyhan disease, D. Transcobalamine deficiency', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Lesch nyhan syndrome is due to deficiency are complete or paial absence of HGP enzyme. It does not involve any type of anaemia Reference : textbbook: pathologic basis of disease Author : Robbins and cotron , volume2 , page number 1215', 'role': 'assistant'}]