Which of the following parts' inner lining is known as gastric mucosa?

The inner lining of the stomach, also known as the gastric mucosa, plays an important role in the digestive process by secreting mucus, hydrochloric acid, and digestive juices. 

Mucus acts as a barrier between the stomach wall and the gastric acid, helping to prevent corrosive effects and lubricate the food as it is being broken down. 

Hydrochloric acid is an extremely strong acid that helps to break down food in the stomach, creating an acidic environment that is favourable for the action of digestive enzymes. 

Digestive juices contain enzymes that help to break down carbohydrates, proteins, and fats.