This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
A patient is admitted with acute organophosphorus insecticide poisoning, develops ptosis, inability to lift the head and difficulty in breathing on the third day. The most likely diagnosis is: TN 06 
Select and explain. 
A. Hypokalemia, B. Inflammatory polyneuropathy, C. Intermediate syndrome, D. Polymyositis
C: Intermediate syndrome
Answer: C: Intermediate syndrome 
Explanation: Ans. Intermediate syndrome