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 users (user_name VARCHAR, password VARCHAR, role_code VARCHAR)
### Question:
List all the username and passwords of users with the most popular role.
### Answer:
SELECT user_name, password FROM users GROUP BY role_code ORDER BY COUNT(*) DESC LIMIT 1