A) Prion
B) Viagra
C) Streptomycin
D) Invading germs
Correct Answer: B
Solution :
The discovery of nitric oxides as a signaling molecule in cardio vascular system which led to the use of Viagra as an anti-impotence drug. Furehgott, J. Ignarro and F. Murad discovered it for wh;ch Nobel Prize was awarded to them in 1998.
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