You will be given a definition of a task first, then some input of the task.
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.

Passage: In 1966, Tony married the family's housekeeper Joan Gustafson; they had two children, Jennifer (born 1967) and Mario (born 1968). At this point, Madonna started to resent him for decades, and developed a rebellious attitude. She attended St. Frederick's and St. Andrew's Catholic Elementary Schools, and West Middle School. Madonna was known for her high grade point average, and achieved notoriety for her unconventional behavior. She would perform cartwheels and handstands in the hallways between classes, dangle by her knees from the monkey bars during recess, and pull up her skirt during classall so that the boys could see her underwear. Question: When was Mario born?
Output:
1968