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 teaches (id VARCHAR, course_id VARCHAR)
TABLE: CREATE TABLE course (course_id VARCHAR, title VARCHAR)
TABLE: CREATE TABLE instructor (name VARCHAR, id VARCHAR)

### Question ###
Find the name of the instructors who taught C Programming course before.

### Accurate SQL ###

SELECT T1.name FROM instructor AS T1 JOIN teaches AS T2 ON T1.id = T2.id JOIN course AS T3 ON T2.course_id = T3.course_id WHERE T3.title = 'C Programming'