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.
Q: Question: Does aminolevulinic Acid-Mediated Photodynamic Therapy cause Cell Death in MG-63 Human Osteosarcoma Cells?
Answer: Collectively, our data indicate that ALA-PDT can result in the death of MG-64 human osteosarcoma cells in vitro.
A:
yes