What is the lowest average finish having top 5s of 0?
CREATE TABLE table_42781 (
    "Year" text,
    "Races" real,
    "Wins" real,
    "Top 5" real,
    "Top 10" real,
    "Poles" real,
    "Avg. Start" real,
    "Avg. Finish" real,
    "Season Rank" text
)
SELECT MIN("Avg. Finish") FROM table_42781 WHERE "Top 5" < '0'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the lowest average finish having top 5s of 0? ### Input: CREATE TABLE table_42781 (
    "Year" text,
    "Races" real,
    "Wins" real,
    "Top 5" real,
    "Top 10" real,
    "Poles" real,
    "Avg. Start" real,
    "Avg. Finish" real,
    "Season Rank" text
) ### Response: SELECT MIN("Avg. Finish") FROM table_42781 WHERE "Top 5" < '0'