Final answer:
Insurance agents working exclusively for one company are known as captive agents and focus on selling that company's products only.
Step-by-step explanation:
Insurance agents who work for one particular company are referred to as captive agents. These agents are exclusive representatives of their employer and do not sell insurance products from competing providers. Unlike independent agents, who represent multiple insurance companies, captive agents are employed by just one firm and are expected to sell and promote the products of that company only. In contrast, an in-house lobbyist would be someone who promotes their employer's interests, often in a legislative context, rather than selling insurance.