NO.PZ2018062007000053
问题如下：
Fiduciary call refers to
选项：
A.short call + long risk-free bond
B.long call + long risk-free bond
C.long call + short risk-free bond
解释：
B is correct.
Fiduciary call= long call +long risk-free bond
中文解析：
Fiduciary call= 买入看涨期权 + 买入无风险资产债券
请问这道题对应哪个知识点
