2015 First Aid Exam No. 3 Taken from the 2015 Northern Regional First Aid Contest held in Clymer, New York Progress Indicator: Question 7 of 30 7.  Drowning from water in the lungs can occur by the body trying to counteract corrosive effects from severe exposure of acids formed by ________________. Choices: Hydrogen Sulfide Oxides of Nitrogen Carbon Monoxide Sulfur Dioxide