This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
[{'content': 'In b-thalassemia there is: \nSelect and explain. \nA. Excess a-chain, B. Reduced a-chain, C. Excess b-chain, D. Reduced b-chain', 'role': 'user'}, {'content': "Answer: D \nExplanation: d. Reduced p-chain(Ref: Ne/sosn's 20/e p 2349, Ghai 8/e p 341)In beta-thalassemia there is reduced b chain and relatively excess chain.", 'role': 'assistant'}]