Describe a strategy to handle complex user input scenarios in Flutter, such as dependent dropdowns where the selection in one affects the options in another.

A effective strategy to handle complex user input scenarios in Flutter, such as dependent dropdowns, is to implement a reactive programming approach with RxDart and BLoC (Business Logic Component). You can use streams and subjects to manage the state of the dropdowns and update the options based on the selection in another dropdown. This approach provides a clean and maintainable solution for handling complex user input scenarios by separating the business logic from the UI components.