input: OPTIONS:
- cross pollutants
- typical pollutants
- secondary contaminants
- secondary pollutants Now, answer this question: Q: What are formed when primary pollutants interact with sunlight, air, or each other? A:
A:
output: secondary pollutants

input: OPTIONS:
- middle of transcription
- aftermath of transcription
- end of transcription
- start of transcription Now, answer this question: Q: Which is one of the most complicated parts of gene regulation in eukaryotic cells? A:
A:
output: start of transcription

input: OPTIONS:
- digestive system
- Muscular system
- nervous system
- excretory system Now, answer this question: Q: What body system gets rid of waste? A:
A:
output:
excretory system