Q: In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Question: Which of the following layers must pass through the sperm to reach the egg during fertilization?
Options: <0> Endometrial zone <1> Pellucid zone. <2> Striated area. <3> Sticky zone <4> Myometrial zone.
A:
pharmacology