In the diagram below, what part of the digestive system is labeled A?

The question is incomplete as the diagram is missing, however, a digestive system diagram is attached related to question:

The answer is - the salivary gland in the oral cavity.

Explanation:

The oral cavity called to the initial segment of the digestive system. Its essential capacity is to fill in as the passage of the nutritious tract and to start the digestion related procedure by salivation and propulsions of the wholesome bolus into the pharynx.

Portions of the mouth incorporate the lips, vestibule, mouth depression, gums, teeth, hard and delicate sense of taste, tongue and salivary organs

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