Custodial Staff (Also Known as Janitors or Cleaners) Are the Unsung

Custodial staff (also known as janitors or cleaners) are the unsung heroes of the workplace. Going about their work while many of us are in bed, they deal with a whole host of situations that bring them into contact with a wide range of chemical and biological agents. They are exposed to residues left in the air and on surfaces from manufacturing processes, from service operations, and from human excretions (sweat, body oils, from sneezing, and so on) . While employees of the firms that they service receive training about specific chemical and biological hazards, the custodial staff are often unaware of some of the hazards that they may encounter.
-Custodial staff may be at more risk of acquiring an illness/injury from acute, rather than ambient, exposure to a chemical or biological agent. How would the cleaning manager know if it was an acute exposure?

A) The cleaner had not worked at that location before.
B) The cleaner could not continue working that day.
C) The cleaner had to go to the hospital right away.
D) The cleaner could not return to work for a week.