The figure below shows part of the primary structure of DNA. Identify the nucleotide. 
Definitions:
Affective Disorder
A category of psychiatric disorders characterized by mood disturbances, such as depression or bipolar disorder.
Cognitive-Behavioral Therapy
A form of psychological treatment that addresses dysfunctional emotions, behaviors, and cognitions through a goal-oriented, systematic process.
Compulsive Behavior Therapy
A type of therapy focusing on identifying and changing harmful compulsive behaviors through various techniques, including cognitive-behavioral therapy.
Counter-Blocking Therapy
A treatment approach intended to counteract or neutralize the effects of another therapy, often used in reference to managing side effects.
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