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.

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

Question: Hot magma beneath the surface mixes with water and forms what? Answer: gas
Hot magma beneath the surface mixes with water and forms gas.

Question: What is the name of the black opening in the eye that lets light enter? Answer: pupil

The pupil is the name of the black opening in the eye that lets light enter.