Which of the following pairs is mismatched? A) Immunologist - studies ecology of Legionella pneumophila B) Virologist - studies human immunodeficiency virus C) Microbial ecologist - studies bacteria that degrade oil D) Microbial physiologist - studies fermentation of sourdough bread E) Molecular biologist - studies recombinant DNA

Immunologist - studies ecology of Legionella pneumophila.

Explanation:

The field biology mainly deals with the study of the living organisms. Biology includes the different sub field like ecology, immunology, cell biology, molecular biology and biotechnology.

The immunology is the field of biology that mainly deals with the antigen - antibody interaction and detailed study of the immune system of the living organisms. The immunologists studies about immunology and not the ecology of the organisms.

Thus, the correct answer is option (A).