identify the functional group.

Explanation:

Step1: Identify part A

Part A is a benzene - like ring structure, which is an aromatic ring.

Step2: Identify part B

The -OH group is a hydroxyl group. In the context of organic chemistry, when attached to an aromatic ring, it is a phenol functional - group.

Answer:

A. Aromatic ring B. Hydroxyl group (Phenol if attached to aromatic ring)