<prompt> Answer this question truthfullyWhat is the most common cause of C-MOPS and what are some symptoms associated with it?  <response>: <reason> Streptococcus pneumoniae is the most common cause of C-MOPS, which stands for conjunctivitis redness and discharge, meningitis fever, chills, headache, neck stiffness, otitis media ear pain, pneumonia fever, cough, chills, and sinusitis nasal discharge, sinus tenderness. 