English to Russian Medical Chemistry; Chem Sci/Eng Contaminated sites

it is a question about contaminated sites and their impact on human health with four answers. Here's the context:


In each contaminated site the identification of diseases of a priori interest is based on:

Answer 4a The epidemiological evidence of risk due to the sources of contamination.
Answer 4b The analysis of contamination in each Contaminated Site.
Answer 4c Both the epidemiological evidence on the risk associated to the sources of contamination and the toxicological profiles of priority index contaminants.
Answer 4d The identification of priority index contaminants.