Assertion: Stanley Miller could work on experimental evidence of origin of life because of Harold Urey.
Reason: H. Urey was geochemist, cosmochemist and teacher of S. miller.

Both Assertion (A) and reason (R) are correct and R is the correct explanation of A.

The Miller-Urey experiment, conducted by chemists Stanley Miller and Harold Urey in 1953, is the classic experiment on the origin of life. It established that the early Earth atmosphere, as they pictured it, was capable of producing amino acids, the building blocks of life, from inorganic substances.