Is the *ghurrah* due for expelling a detached part of the human body, such as a limb or a head?

Primary text

If a hand, foot, head, or any part of the human being is expelled, the *ghurrah* is obligatory, as the identity of the expelled part as originating from the fetus is confirmed. If two heads or four hands are expelled, only one *ghurrah* is due, because it is possible that all these parts originated from a single fetus, and liability cannot be increased based on doubt, as the default principle is the acquittal of liability. Similarly, liability is not established if nothing appears externally, as doubt prevails.