Which organ grinds food into a semiliquid while adding acid, enzymes, and gastric juice?

Stomach is the correct answer.

Explanation:

The stomach is the very important organ of the body that digests the food.The cells in the stomach secrete enzymes and hydrochloric acid that breaks the food chemically into small molecules.The stomach secretes substances that control the food digestion.The gastric juice is formed in the stomach and it contains hydrochloric acid, organic substances(pepsin, protein, mucus) it helps in the digestion of food.

I think the answer to this would be A