Final answer:
The Academic Skeptics and post-modernists are Schools of Thought which would say that no 'true' knowledge exists, questioning the possibility of certain and objective knowledge. They emphasize the relativity and subjectivity of beliefs and challenge the traditional Platonic view of knowledge as justified true belief.
Step-by-step explanation:
The School of Thought that would assert that no such thing as "true" knowledge exists is closely aligned with skepticism, particularly the perspectives of the Academic Skeptics and the principles of post-modernism. The Academic Skeptics, following the footsteps of Greek philosopher Socrates, posited that true knowledge is impossible to achieve and instead advocated for the notion of relative degrees of belief. Similarly, post-modernism challenges the concept of objective knowledge, arguing that all understandings are merely interpretations of reality, without access to any absolute truth.
Disciples of Pyrrho took skepticism even further by stating that one cannot reliably claim any certain knowledge, not even the knowledge of our own ignorance. They believed in suspending judgment entirely regarding knowledge claims. In stark contrast to the belief that knowledge is justified true belief, as was widely accepted since Plato, these philosophers suggest a more complex and uncertain relation to what is known and knowable.
The Frankfurt School also criticized the concept of true knowledge as being detached from the world, reflecting a deep skepticism about the possibility of obtaining clear, objective knowledge. Philosophical inquiry challenges these concepts by exploring the limits and nature of knowledge.