Why should scientists always wash their hands after conducting an experiment and never eat food in a laboratory?

Question

(Select all that apply)

Several chemicals are known to cause irritation to the eyes if touched with contaminated hands.

Many chemicals can react with other substances or materials they interact with, such as food.

Many chemicals are known to be flammable if exposed to an intense heat source.

Several chemicals are known to be toxic if ingested, and some cause skin irritations.

A and D?