In this task, you will be given sentences in which your task is to recognize the name of the organ of the body. An organ is a collection of tissues that structurally form a functional unit specialized to perform a particular function. Although there might be several correct answers, you need to write one of them.
Q:  The placenta biopsy sample was collected at a depth of 1 cm and at a distance of 8 cm from the edge of the placenta , with the maternal side facing upward .
A: 
placenta