Which of the following departments studies poisonous substances

Medications refer to substances used for therapeutic purposes in treating diseases or alleviating symptoms. While toxicology can study the adverse effects of medications, the term 'medications' itself does not specifically relate to the study of poisonous substances.

This phrase appears to be incomplete and lacks specificity. While understanding the effects of substances on the body is indeed part of toxicology, it does not identify a specific department or field of study. It merely describes a component of what toxicologists do.

Hematology is the study of blood and blood disorders, focusing on components such as red blood cells, white blood cells, and platelets. While hematology may intersect with toxicology in certain cases, it does not specifically concern itself with poisonous substances.

Microbiology is the study of microorganisms, including bacteria, viruses, and fungi. Though some microorganisms can produce toxins, microbiology does not primarily focus on the study of poisonous substances, making it less relevant to the question at hand.