Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
One example: Context: Architecturally, the school has a Catholic character. Atop the Main Building's gold dome is a golden statue of the Virgin Mary. Immediately in front of the Main Building and facing it, is a copper statue of Christ with arms upraised with the legend 'Venite Ad Me Omnes'. Next to the Main Building is the Basilica of the Sacred Heart. Immediately behind the basilica is the Grotto, a Marian place of prayer and reflection. It is a replica of the grotto at Lourdes, France where the Virgin Mary reputedly appeared to Saint Bernadette Soubirous in 1858. At the end of the main drive (and in a direct line that connects through 3 statues and the Gold Dome), is a simple, modern stone statue of Mary.
Question: To whom did the Virgin Mary allegedly appear in 1858 in Lourdes France?
Solution is here: Saint Bernadette Soubirous
Explanation: This is the correct answer. Because the question is asking for the name of the person and following sentence from the passage answers it: It is a replica of the grotto at Lourdes, France where the Virgin Mary reputedly appeared to Saint Bernadette Soubirous in 1858.

Now, solve this: Context: Marek was a farmer who lived in a village far away. One day he became very ill, and everyone thought he would die. They sent for a doctor, who arrived two days later and examined the sick man. The doctor asked for a pen and some paper to write down the name of the medicine. But there was no pen or paper in the village, because no one could read or write. The doctor picked up a piece of burnt wood from the fire. Using the wood, he wrote the name of the medicine on the door of the house. "Get this medicine for him," he said,"and he will soon get better." Marek's family and friends did not know what to do. They could not read the strange writing. Then the village baker had an idea. He took off the door of the house, put it on his cart and drove to the nearest town. He bought the medicine, and Marek was soon well again. He would not let anyone wash the magic words away from the door.
Question: On what did the doctor write the name of the medicine?
Solution:
the door of the house.