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': 'Deletion of one alpha globin gene on one chromosome is best defined as \nSelect and explain. \nA. Hb Bas hydrops fetails, B. Alpha thalassemia major, C. Alpha thalassemia trait, D. Alpha thalassemia silent carrier', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Alpha thalassemia silent carrier", 'role': 'assistant'}]