This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

[Q]: Passage: On November 13, 1988, approximately 10,000 people attended an officially sanctioned meeting organized by the cultural heritage organization Spadschyna, the Kyiv University student club Hromada, and the environmental groups Zelenyi Svit ("Green World") and Noosfera, to focus on ecological issues. From November 14–18, 15 Ukrainian activists were among the 100 human-, national- and religious-rights advocates invited to discuss human rights with Soviet officials and a visiting delegation of the U.S. Commission on Security and Cooperation in Europe (also known as the Helsinki Commission). On December 10, hundreds gathered in Kiev to observe International Human Rights Day at a rally organized by the Democratic Union. The unauthorized gathering resulted in the detention of local activists. Question: What did people gather to observe on December 10th?
[A]: International Human Rights Day


[Q]: Passage: Israel retaliated against Egyptian shelling with commando raids, artillery shelling and air strikes. This resulted in an exodus of civilians from Egyptian cities along the Suez Canal's western bank. Nasser ceased all military activities and began a program to build a network of internal defenses, while receiving the financial backing of various Arab states. The war resumed in March 1969. In November, Nasser brokered an agreement between the PLO and the Lebanese military that granted Palestinian guerrillas the right to use Lebanese territory to attack Israel. Question: Who would get to attack Israel from Lebanon?
[A]: Palestinian guerrillas


[Q]: Passage: Forests cover 24 percent of Oklahoma and prairie grasslands composed of shortgrass, mixed-grass, and tallgrass prairie, harbor expansive ecosystems in the state's central and western portions, although cropland has largely replaced native grasses. Where rainfall is sparse in the western regions of the state, shortgrass prairie and shrublands are the most prominent ecosystems, though pinyon pines, red cedar (junipers), and ponderosa pines grow near rivers and creek beds in the far western reaches of the panhandle. Southwestern Oklahoma contains many rare, disjunct species including sugar maple, bigtooth maple, nolina and southern live oak. Question: What types of prairie grasslands does Oklahoma have?
[A]:
shortgrass, mixed-grass, and tallgrass prairie