Which types of fish contain the lowest levels of mercury?
The following types of fish contain low levels of mercury: salmon, flounder, Atlantic mackerel, anchovies, pollock, catfish, and shellfish (e.g., clams, scallops, mussels).
Instruction: Which types of fish contain the lowest levels of mercury?
Context: 
Response: The following types of fish contain low levels of mercury: salmon, flounder, Atlantic mackerel, anchovies, pollock, catfish, and shellfish (e.g., clams, scallops, mussels).