Task: Question Answering
Input (English): Passage: In November, a white, city-bred teenaged schoolgirl and her much-younger brother become stranded in the wilderness after their father goes berserk. After driving them far into the Australian outback, ostensibly for a picnic, the father suddenly begins shooting at the children. They run behind rocks for cover, whereupon he sets the car on fire and shoots himself in the head. The girl conceals what has happened from her brother and, after grabbing some food and supplies, the pair head out into the desert.
By the middle of the next day, they are weak and the boy can barely walk. Discovering a small water hole with a fruiting tree, they spend the day playing, bathing, and resting. By the next morning, the water has dried up. They are then discovered by an Aboriginal boy. Although the girl cannot communicate with him, due to the language barrier, her brother mimes their need for water and the newcomer cheerfully shows them how to draw it from the drying bed of the oasis. The three travel together, with the Aboriginal boy sharing food he has caught hunting. The boys learn to communicate slightly using words and sign language.
While in the vicinity of a plantation, a white woman walks past the Aboriginal boy, who simply ignores her when she speaks to him. She appears to see the other children, but they do not see her, and they continue on their journey. The children also discover a weather balloon belonging to a nearby research team working in the desert. After drawing markings of a modern-style house, the Aboriginal boy eventually leads them to an abandoned farm, and takes the other boy to a nearby road. The Aboriginal boy hunts down a water buffalo and is wrestling it to the ground when two white hunters appear in a truck and nearly run him over. He watches in shock as they shoot several buffalo with a rifle. The boy then returns to the farm, but passes by without speaking. 
Question: Who commits suicide?
Output (English): father.