Give me a list of descriptions of the problems that are reported by the staff whose first name is Christop.
CREATE TABLE staff (
    staff_id VARCHAR,
    staff_first_name VARCHAR
)

CREATE TABLE problems (
    problem_description VARCHAR,
    reported_by_staff_id VARCHAR
)
SELECT T1.problem_description FROM problems AS T1 JOIN staff AS T2 ON T1.reported_by_staff_id = T2.staff_id WHERE T2.staff_first_name = "Christop"
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: Give me a list of descriptions of the problems that are reported by the staff whose first name is Christop. ### Input: CREATE TABLE staff (
    staff_id VARCHAR,
    staff_first_name VARCHAR
)

CREATE TABLE problems (
    problem_description VARCHAR,
    reported_by_staff_id VARCHAR
) ### Response: SELECT T1.problem_description FROM problems AS T1 JOIN staff AS T2 ON T1.reported_by_staff_id = T2.staff_id WHERE T2.staff_first_name = "Christop"