Question

for years, doctors have been puzzled by the condition known as capgras delusion, in which a person believes that his or her family members and friends have been replaced by impostors. neurologist v. s. ramachandran has suggested that capgras delusion might be a result of a disconnection between the ‘fusiform face area,’ a region of the brain involved in face perception, and the amygdala, which is involved in the emotional responses to familiar faces. ramachandran hypothesized that, due to the severing of the connection between the face recognition area and the amygdala, capgras patients just don’t feel the emotional response they expect to feel upon seeing a family member or friend—leading them to believe that the family member or friend they see must be an impostor.
question
what is the primary purpose of this passage?
to show the importance of family members and friends in people’s lives
to provide new information about the regions of the brain
to report on a possible explanation for an unusual phenomenon
to demonstrate the methods scientists use to gather evidence for their hypotheses

Explanation:

The passage first introduces Capgras Delusion (an unusual phenomenon). Then it presents a neurologist's (Ramachandran) possible explanation (a disconnection between the fusiform face area and the amygdala) for this delusion.

Answer:

C. To report on a possible explanation for an unusual phenomenon