Map subject to its branch of study: “Cells : Cytology”. Choose the option that preserves the same “X : study of X” relation.

Introduction / Context:
This is a subject-to-discipline mapping. Cytology is the study of cells. We must identify the option where the second term names the scientific study of the first.

Given Data / Assumptions:
Key biological branches: entomology = study of insects; ornithology = study of birds (not worms); ichthyology = study of fishes; physiology = functions of organisms (not specifically diseases); morphology = form/structure (tissues are studied in histology).

Concept / Approach:
Only “Insect : Entomology” correctly mirrors “Cells : Cytology.” The others intentionally mismatch subject and field names to test vocabulary precision.

Step-by-Step Solution:

Verification / Alternative check:
Any biology glossary confirms the definitions above.

Why Other Options Are Wrong:
They pair subjects with the wrong disciplines.

Common Pitfalls:
Confusing similar-sounding disciplines (ornithology vs ichthyology) or functional vs structural biology (physiology vs histology/morphology).

Final Answer:
Insect : Entomology