Which clinical symptom is most characteristic of tetanus toxin's effect on neurons? A. Flaccid paralysis B. Severe diarrhea C. Spastic paralysis (muscle rigidity) D Vision loss

The correct answer is C. Spastic paralysis (muscle rigidity).<br /><br />Tetanus toxin is a neurotoxin produced by the bacterium Clostridium tetani. It affects the nervous system by blocking the release of inhibitory neurotransmitters, leading to increased muscle contraction and rigidity. This results in spastic paralysis, characterized by muscle stiffness and rigidity.