Digestion of protein is completed in

Digestion of starch starts from the mouth, whereas $A$ is the site of digestion mainly for $B$. Choose the correct combination of options to complete the given statement.

In mammals,the digestion of starch starts from:

Which vitamin is absorbed due to the intrinsic factor secreted by parietal cells of the stomach?

Describe the process of digestion occurring in the oral cavity.

The enzyme which converts proteins into peptones is