Dosa and Idli are fermented preparation of rice and black gram. The fermentation is done with

$A$ : Curd is more nutritious than milk.

$R$ : $LAB$ present in curd checks growth of disease causing microbes.

In the production of leavened bread, the following is used

Which gas is released during the process of fermentation that gives the puffy appearance to dough for making bread

Streptococcus thermophilus and Lactobacillus bulgaricus are being used for the production of