Final answer:
The friend's nonsensical speech despite fluency suggests damage to Wernicke's area, which is associated with language comprehension.
Step-by-step explanation:
The response given by the friend, which is full of nonsensical language despite a steady flow of speech, is indicative of damage to Wernicke's area. This area of the brain is critical for the comprehension of language. Wernicke's area is not responsible for production of speech but rather for processing and understanding the meaning of the words that are heard. A person with damage to this area can produce fluent speech but it will often lack meaning or be filled with invented or irrelevant words, a condition known as receptive aphasia or Wernicke's aphasia. This is in contrast to damage to Broca's area, which results in expressive aphasia where the person struggles to articulate speech but their understanding of language remains relatively intact.