Given the task definition and input, reply with output. Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.

Question: Is photodynamic Therapy with 5 % -Aminolevulinic Acid Safe and Effective Treatment of Acne Vulgaris in Japanese Patients?
Answer: Our protocol was effective for acne in Japanese and did not exhibit severe side effects.
yes