Read the given paragraph: “It is lined by glandular and ciliated cells. It absorbs nitrogenous wastes and convert them into uric acid which is excreted through the hindgut”. Which of the following structures of cockroach is referred here?

Question

$\begin{array}{1 1} \text{a. Trachea} \\ \text{b. Hepatic caecum} \\ \text{c. Tergum} \\ \text{d. Malpighian tubule} \end{array} $