In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Example Input: Question: What is secreted before ejaculation to neutralize acidic urine remaining in the urethra? Answer: clear mucus
Example Output: Clear mucus is secreted before ejaculation to neutralize acidic urine remaining in the urethra.

Example Input: Question: What are a class of tetrapod vertebrates that produce amniotic eggs called? Answer: reptiles
Example Output: Reptiles are a class of tetrapod vertebrates that produce amniotic eggs called.

Example Input: Question: What type of proteins bind to foreign substances and attempt destruction? Answer: antibodies
Example Output:
Antibodies bind to foreign substances and attempt destruction.