C
that’s the only negative effect
I think it's B. Because if you're wearing something that filters oxygen (E.g. gas mask) and the substance becomes airborne, the filters in the protective gear might be overworked if the substance density is greater than the filtering capacity.
<span>Medication for STIs only needs to be taken until the symptoms go away.
This is false. </span>
always watch who your dealing with on social media