问题如下：
4. Based on his trading strategy, which of the following should Hartmann recommend?
选项：
A.Short HG Health and Corgent Cell Sciences
B.Buy Johnson Labs and Corgent Cell Sciences
C.Buy Johnson Labs and short Corgent Cell Sciences
解释：
C is correct.
Pairs trading involves buying an undervalued stock and shorting an overvalued stock in the same industry. Hartmann should buy Johnson Labs (15% undervalued) and short Corgent Cell Sciences (10% overvalued).
A。这种两个都short策略不对吗？
