Identify the reaction, which is not related to extraction of copper

• A

  $2 \mathrm{Cu}_2 \mathrm{~S}+3 \mathrm{O}_2 \rightarrow 2 \mathrm{Cu}_2 \mathrm{O}+2 \mathrm{SO}_2$
• B

  $2 \mathrm{FeS}+3 \mathrm{O}_2 \rightarrow 2 \mathrm{FeO}+2 \mathrm{SO}_2$
• C

  $\mathrm{FeO}+\mathrm{SiO}_2 \rightarrow \mathrm{FeSiO}_3$
• Correct answer
  D

  $\mathrm{SiO}_2+\mathrm{CaO} \rightarrow \mathrm{CaSiO}_3$

Hence, the correct answer is option: 'D'.