Afghanistan opposed Pakistan membership of ___?

The correct answer is UNO. Afghanistan was the only country to cast a negative vote against Pakistan's admission to the United Nations Organization (UNO) in 1947. This opposition stemmed primarily from Afghanistan's historical claims over Pashtun-majority areas along the Durand Line, which it considered disputed territory. Pakistan's membership was eventually approved despite this lone objection.

• OIC (Organization of Islamic Cooperation): Both Pakistan and Afghanistan are members, and there was no opposition to Pakistan's membership.
• NAM (Non-Aligned Movement): Both countries are also members of NAM, and there was no such opposition.
• SCO (Shanghai Cooperation Organization): Both countries are involved with SCO (Pakistan as a full member, Afghanistan as an observer), but this organization was formed much later, and no such opposition occurred.