You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.

Passage: Martin Luther married Katharina von Bora, one of 12 nuns he had helped escape from the Nimbschen Cistercian convent in April 1523, when he arranged for them to be smuggled out in herring barrels. Suddenly, and while I was occupied with far different thoughts, he wrote to Wenceslaus Link, “the Lord has plunged me into marriage. At the time of their marriage, Katharina was 26 years old and Luther was 41 years old. Question: In a letter who did Luther credit for his union with Katharina?
Solution: the Lord
Why? The paragraph clearly states that, Luther has credited the Lord for his union with Katharina, hence the Lord is correct answer.

New input: Passage: The programme's first serial, An Unearthly Child, shows that the Doctor has a granddaughter, Susan Foreman. In the 1967 serial, Tomb of the Cybermen, when Victoria Waterfield doubts the Doctor can remember his family because of, 'being so ancient', the Doctor says that he can when he really wants to—'The rest of the time they sleep in my mind'. The 2005 series reveals that the Ninth Doctor thought he was the last surviving Time Lord, and that his home planet had been destroyed; in 'The Empty Child' (2005), Dr. Constantine states that, 'Before the war even began, I was a father and a grandfather. Now I am neither.' The Doctor remarks in response, 'Yeah, I know the feeling.' In 'Smith and Jones' (2007), when asked if he had a brother, he replied, 'No, not any more.' In both 'Fear Her' (2006) and 'The Doctor's Daughter' (2008), he states that he had, in the past, been a father. Question: In 2005, what did Doctor Who think the condition of his home planet was?
Solution:
destroyed