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: Medicine
[{'content': 'Haemoglobin F is raised in: \nSelect and explain. \nA. Juvenile chronic myeloid leukemia, B. Hereditary spherocytosis, C. Congenital red cell aplasia, D. Mysthania gravis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer is A (Juvenile CML) Fetal Haemoglobin levels (HbF) are increased in most cases of Juvenile CML - Causes of Raised HbF levels (Interpretation of Diagnostic Test 8th/411, 412) Haemoglobinopathies - b thalassemia major - b thalassemia minor - Sickle cell disease Hereditary Persistance of HbF Anemia: - Non Hereditary refractory normoblastic anemia - Pernicious anemia - Aplastic anemia Leukemia specially Juvenile Myeloid Leukemia Multiple myeloma Molar pregnancy Patients with Trisomy 13 or Trisomy 21 (Down's syndrome) Some chronic viral infections (eg CMV, EBV)", 'role': 'assistant'}]