22 . Nigeria has ratified the following United Nations human rights instruments in partial fulfillment of this recommendation . These are the International Convention for the Protection of All Persons from Enforced Disappearance , the Convention on the Prevention and Punishment of the Crime of Genocide , Optional Protocol to the Convention against Torture ( OP-CAT ) , the Optional Protocol on the Sale of Children , Child Prostitution and Child Pornography and the Optional Protocol on the Involvement of Children in Armed Conflict .