Biology · MICROBES IN HUMAN WELFARE

Consider the following statements about microbes in household products: (A) Curd contains millions of lactic acid bacteria (LAB) which improve nutritional quality by increasing vitamin B12. (B) The puffed-up appearance of dough for dosa and idli is due to carbon dioxide production. (C) Swiss cheese has large holes due to production of \( \text{CO}_2 \) by Propionibacterium sharmanii. (D) Toddy is made by fermenting sap from palms. How many of the above statements are correct?

1. Only two
2. All four
3. Only three
4. None