fiduciary call是什么意思？

问题如下：

Holding an asset and buying a put on that asset is equivalent to:

选项：

A.

initiating a fiduciary call.

B.

buying a risk- free zero- coupon bond and selling a call option.

C.

selling a risk- free zero- coupon bond and buying a call option.

解释：

A is correct. Under put–call parity, initiating a fiduciary call (buying a call option on an asset that expires at time T together with a risk- free zero- coupon bond that also expires at time T) is equivalent to holding the same asset and initiating a protective put on it (buying a put option with an exercise price of X that can be used to sell the asset for X at time T).

中文解析：

这道题考察的是put-call parity

我们看等式右边就是holding an asset and buying a put，等于等式左边的部分，等式左边的部分刚好就是fiduciary call