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: Pharmacology
[{'content': 'Which of the following is the most reliable clinical endpoint to indicate adequate atropinisation in organophosphate poisoning: \nSelect and explain. \nA. Pupillary dilatation, B. Control of diarrhea, C. Heart rate more than or equal to 100 beats/min, D. Absence of pulmonary secretions', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]