Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE course (title VARCHAR, course_id VARCHAR)
TABLE: CREATE TABLE prereq (prereq_id VARCHAR, course_id VARCHAR)
TABLE: CREATE TABLE course (course_id VARCHAR, title VARCHAR)

### Question ###
What is the title of the prerequisite class of International Finance course?

### Accurate SQL ###

SELECT title FROM course WHERE course_id IN (SELECT T1.prereq_id FROM prereq AS T1 JOIN course AS T2 ON T1.course_id = T2.course_id WHERE T2.title = 'International Finance')