After passing the final approach fix, if tower reports visibility below minimums, what action should you take?

Proceeding to MDA (Minimum Descent Altitude) or DH (Decision Height) before making a decision is a prudent approach because it allows for an assessment of the situation at a critical phase of the approach. By continuing the approach, you can evaluate the conditions visually and determine if it's safe to land or if you need to execute a go-around based on what you observe.

If visibility is reported below minimums before reaching the final approach fix, it is essential to monitor the conditions closely as you descend. Arriving at MDA/DH will provide you with the opportunity to make a final determination of whether or not the approach is viable based on visual references. If you reach this point and do not have the required visual references necessary for a safe landing, the appropriate action would be to execute a go-around, ensuring safety while adhering to regulatory requirements. This option embodies the necessary caution while allowing the pilot to fully assess the current environment before making a final decision on how to proceed.