The sizes of several biological structures are indicated in the figure below. 
Which of the following is the smallest structure you could see with a light microscope?
Definitions:
Psychiatric Problems
Mental health conditions that affect a person's thinking, feeling, behavior, and interaction with others.
Cultural Background
The cultural context and environment a person is raised in, including traditions, languages, beliefs, and practices that influence their worldview.
Freud
Sigmund Freud, an Austrian neurologist and the founder of psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst.
Human Nature
Fundamental traits, behaviors, and feelings that are inherent to human beings, often considered a combination of inherited and societal factors.
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