The opening of the rectum to the exterior of the body

The mouth and the anus are the two openings of the digestive system.
1. The mouth aids in food intake and is located at the beginning of the alimentary canal on the ventral surface of the human body.
2. The terminal aperture of the rectum located on the dorsal surface is known as the anus.
It aids in releasing the waste products.

Hence, the correct answer is option (A)