This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Forensic Medicine
[{'content': 'A 40 YR OLD MAN , WORKING IN FARM PRESENTED WITH HEADACHE MALASIE SENSE OF TIGHTNESS DIMNESS OF VISION . ON EXAMINATION PUPILS WERE SHOWN AS BELOW ? WHAT IS TH EDIAGNOSIS ? \nSelect and explain. \nA. LEAD POISONING, B. ORGANO PHOSPHOROUS, C. NICKLE POISONING, D. COCIANE', 'role': 'user'}, {'content': 'Answer: B \nExplanation: REF : NARAYANA REDDY', 'role': 'assistant'}]