A patient presents with symptoms including bronchodilation, elevated body temperature, constipation, and rapid heart rate. What is the most likely diagnosis?

Explanation

The combination of bronchodilation, fever, constipation, and tachycardia is characteristic of atropine poisoning. Organophosphate poisoning typically causes bronchoconstriction, excessive salivation, and bradycardia, which are opposite effects. Paracetamol (acetaminophen) overdose mainly affects the liver and does not cause these symptoms. Mushroom poisoning symptoms vary but usually include gastrointestinal distress and neurological effects rather than this specific symptom set.