Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_50 (lap_length VARCHAR, category VARCHAR)
### Question:
What is the Lap Length of the race with a Grand Prix Fia Category?
### Answer:
SELECT lap_length FROM table_name_50 WHERE category = "grand prix fia"