This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Leptocytosis is seen in : \nSelect and explain. \nA. Iron deficiency, B. Thalassaemia, C. Chronic liver disease, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Leptocytosis is the presence of unusually thin red cells. Leptocytes are seen in severe iron deficiency and\xa0thalassaemia. Target cell is a form of leptocyte in which\xa0there is central round stained area and a peripheral rim\xa0of haemoglobin. Target cells are found in iron deficiency,\xa0thalassaemia, chronic liver disease, and after splenectomy.', 'role': 'assistant'}]