This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
[{'content': 'O.P.C. Poisoning is characterised by all, except: \nSelect and explain. \nA. Pulmonary oedema, B. Pin point pupil, C. Constipation, D. Vomiting', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Symptoms of OP Compound Poisoning: Muscarinic symptoms: Bronchoconstriction Bronchorrhea Bradycardia Miosis Sweating Salivation Lacrimation Micturition diarrhoea Nicotinic symptoms: Fasciculation Dyspnoea Cyanosis', 'role': 'assistant'}]