Answer:
The correct option is hematology
Step-by-step explanation:
Hematology can simply be defined as the study and treatment of blood. Hematology provides a comprehensive understanding of the blood including blood anatomy, blood physiology and blood pathology. Hematology tests are usually carried out to determine these properties in patients/individuals.
NOTE:
Histology is the study of microscopic anatomy of cells, tissues and organs. This micro-analysis on the cell/tissue/organ can only be seen via a microscope.
Heterology is the study of irregularity in the arrangement and structure of tissues.