Task: Question Answering
Input (English): Passage: Today I want to hardboil two fresh eggs for my lunch . I keep the eggs cold in my refrigerator , so I open the refrigerator door and take out two eggs . I place them on the counter , far back so they will not roll off . Then I carefully pick up one egg and place it gently in the pan of water . Did I forget the other egg ? No , I pick it up next and again put it carefully in the pan of water . Not quite , so I add a little more water until both eggs are covered with water . I have a gas stove . I want to turn on the left front small burner . So I turn the left knob until it clicks . Then the gas flame lights and is providing heat for me to cook the eggs . Next I pick up the pan of water with two eggs in it . Now I must watch the pan of water and eggs . I know the water must get hot to boil the eggs . In fact the water must boil with bubbles . When the water boils , then I watch the clock on the stove for 3 minutes . After 3 minutes I turn the left knob on the front of the stove to `` off '' and the flame goes away . Now I let the water cool so I will not burn myself with the hot water . I put them in a small bowl . They are still in their shells . I decide to put the two boiled eggs back in the refrigerator to get them cold for my lunch . I will eat them when I am hungry . Question: What makes the water hot? Option1: gas flame light Option2: left knob
Output (English): gas flame light