请问这一题目涉及到哪个知识点呢？

问题如下：

Which of the following statements about credit derivative is most correct?

选项：

a credit protection buyer provides protection to a seller against a specific credit loss.

a credit protection seller provides protection to a buyer against a specific credit loss.

the clearing house provides protection to a buyer against a pecific credit loss.

解释：

B is correct.

A credit derivative is a class of derivative contracts between two parties, a credit protection buyer and a credit protection seller, in which the latter provides protection to the former against a specific credit loss.

对于信用衍生品来说，如果发生credit loss，是由卖方支付给买方相应的损失，而不是由clearing house，所以正确选项是B。