Write SQL query to solve given problem: How many courses does Alvera McQuillin take?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T1.course_id) FROM registration AS T1 INNER JOIN student AS T2 ON T1.student_id = T2.student_id WHERE T2.f_name = 'Alvera' AND T2.l_name = 'McQuillin'