17. A health professional shall not comply with the request of a grantee to withhold or withdraw medical treatment from the grantor unless satisfied that—
(a) the power of attorney under which the grantee's request is made complies with this Act; and
(b) the grantee—
(i) understands the information given under subsection 16 (1); and
(ii) has weighed the various options and, as a result, affirms his or her request.