This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
Priapism is seen in 
Select and explain. 
A. Rat poisoning, B. Arsenic poisoning, C. Sildenafil poisoning, D. Cantharide poisoning
D: Cantharide poisoning
Answer: D: Cantharide poisoning 
Explanation: The Spanish fly (Cantharis vesicatoria, blister beetle) is 2 x 0.6 cm in dimensions. Active principle: Cantharidin.Action: It is locally irritant and nephrotoxic agent Priapism in males and aboion in pregnant females may occur. The patient becomes prostrated with convulsions, and coma preceding death. TreatmentGastric lavage, demulcents (but not fat) and symptomatic treatment. Ref: Krishnan vij Textbook of Forensic Medicine ; 5th ed; Page no: 486