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Vinu and Priyan take their lunch at school. Vinu eats lemon rice and Priyan eats curd rice. Both lemon rice and curd rice are sour in taste. What is the reason?
  •  is found in curd. Curd rice has a  sour flavour due to the .
  •  is found in lemon juice. Lemon rice has a flavour due to the .