Priapism occurs with

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A. Spanish fly                                     B. Sea snake bite
C. Scorpion bite                                  D. Rattle snake bite.

Answer: A.

Explanation:

• Spanish fly or Cantherides is also known as Blister beetle.
• The active principle of its dried body powder is 'cantharidin'. When applied to skin, blisters or vesicle appear.
• When it is swallowed, it produces    
• 1. burning sensation in the mouth, throat, esophagus, stomach and abdomen
• 2. intense thirst and haematemisis.
• 3. diarrhoea with blood and mucus.
• 4. nephrotoxicity
• 5. priapism(painful and persistent erection of penis) in males.
• 6. in females engorgement of vulva and abortion may occur.
• 7. finally convulsions, coma and death occurs.

Medico legal importance:

•     accidental poisoning may occur from eating fowls which have ingested cantharides, use of blistering plaster that contain cantharis.
• used as an aphrodisiac or abortifacient.