What is the fine-grained topic of the following text: "With [Houghton Mifflin Harcourt] serving as the exclusive distributor of easyCBM, teachers across the nation now have available a learning management system to use in their classrooms and schools," said Gerald Tindal, director of BRT. Only return the topic.
Houghton Mifflin Harcourt's exclusive distribution of easyCBM learning management system.