Hear me out, how many Benadryl's can you take to OD?

this is serious.

Blast chiller

Explanation:

Vehicles of contamination help micro-organisms move from one place to another and hence can be a route for contamination.

Of the listed options, Blast Chillers are not vehicles of contamination. Blast Chillers are a bit like advanced freezers because they are used to freeze food at a fast rate. This ensures that food does not remain in the "danger zone temperature of contamination" - period between temperature food is cooked at and temperature it cools at".

As a result of this rapid freezing, items inside a blast chiller stand a way smaller chance of being contaminated as the low temperatures hamper bacterial growth.