The correct answer is: A. Body : Physiology
The relationship between “animal” and “zoology” is that “zoology” is the scientific study of animals. Similarly, the relationship between “body” and “physiology” is that “physiology” is the scientific study of the function of the human body.
The other options do not have the same relationship. “Disease” is not the scientific study of the human body, but rather the study of a particular type of condition that affects the body. “Poems” are not the scientific study of the human body, but rather a form of creative writing. “Man” is not the scientific study of the human body, but rather a general term for an adult male human.