Final answer:
Broker A is always required to disclose his interest, regardless of Buyer B's request.
Step-by-step explanation:
In the scenario where Broker A is selling property to Buyer B, Broker A is always required to disclose his interest, regardless of Buyer B's request. This is because Broker A has a fiduciary duty to act in the best interest of Buyer B and provide all relevant information that could influence their decision. Failing to disclose his interest would be considered a breach of this duty and could result in legal consequences.