习题：
　　Exercise：
　　Which of the following best describes the GMB MCS?
　　A     Stochastic drift (scaling with time) plus deterministic shock (volatility scaling with square root of time).
　　B     Stochastic drift (scaling with square root of time) plus deterministic shock (volatility scaling with time).
　　C     Deterministic drift (scaling with time) plus stochastic shock (volatility scaling with square root of time).
　　D     Deterministic drift (scaling with square root of time) plus stochastic shock (volatility scaling with time).
　　Answer: C
　　Deterministic drift (scaling with time) plus stochastic shock (volatility scaling with square root of time).
　　相关知识点：
　　Geometric Brownian Motion(GBM) Model
　　Where:
　　St = asset price
　　dSt = infinitesimally small price changes
　　= constant instantaneous drift term
　　= constant instantaneous volatility
　　dz = normally distributed random variable (mean = 0, variance = dt)
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