The correct option is C Protein particles
Creutzfeldt Jakob disease (CJD) is a rare, degenerative fatal brain disorder. CJD is caused by a protein known as a prion. Infectious prions are misfolded proteins that can cause normally folded proteins to become misfolded. Prions cause the progressive death of the brain's nerve cells which is associated with the build-up of abnormal prion protein molecules forming amyloids that cause brain damage and death. So, the correct answer is 'Protein particles'.