Doctor, pharmacists, internet,library, medical board
To be honest, I'm not that sure on which one it is, but given choices lead me to think is the nervous system, probably because that's the reason our bodies are functioning, and compared to all other systems, the brain and the nervous system are needed for survival, otherwise you wouldn't be living.
<span>HIV antibody tests look for these antibodies to HIV in your blood or oral fluid. The soonest an antibody test will detect infection is 3 weeks. Most (approximately 97%), but not all, people will develop detectable antibodies within 3 to 12 weeks (21 to 84 days) of infection</span>
Go to the nearest faucet and clean it. The report to a teacher and they will take care of it