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Combat HIV/AIDS, Malaria and Other Diseases environment correct; market failure due to externalities public goods.
Ref: NCERT Economics Class XI Environment Sustainable Development explains environmental degradation market failure sustainable goals conservation strategies.
2015 correct per microeconomics basics; central problems scarcity choice opportunity cost.
Ref: NCERT Economics Class XI Chapter 1 Introduction to Microeconomics explains central problems scarcity choice PPC opportunity cost concepts clearly.
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