instruction:
This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
question:
Dogs bear their litters roughly 58 to 68 days after fertilization, with an average of 63 days, although the length of gestation can vary. An average litter consists of about six puppies, though this number may vary widely based on the breed of dog. In general, toy dogs produce from one to four puppies in each litter, while much larger breeds may average as many as twelve.
answer:
How long do female dogs carry before delivering puppies?


question:
Fortaleza del Cerro overlooks the bay of Montevideo. An observation post at this location was first built by the Spanish in the late 18th century. In 1802, a beacon replaced the observation post; construction of the fortress began in 1809 and was completed in 1839. It has been involved in many historical developments and has been repeatedly taken over by various sides. In 1907, the old beacon was replaced with a stronger electric one. It has been a National Monument since 1931 and has housed a military museum since 1916. Today it is one of the tourist attractions of Montevideo.
answer:
What overlooks the bay of Montevideo?


question:
In response to demands for a German liturgy, Luther wrote a German Mass, which he published in early 1526. He did not intend it as a replacement for his 1523 adaptation of the Latin Mass but as an alternative for the "simple people", a "public stimulation for people to believe and become Christians." Luther based his order on the Catholic service but omitted "everything that smacks of sacrifice"; and the Mass became a celebration where everyone received the wine as well as the bread. He retained the elevation of the host and chalice, while trappings such as the Mass vestments, altar, and candles were made optional, allowing freedom of ceremony. Some reformers, including followers of Huldrych Zwingli, considered Luther's service too papistic; and modern scholars note the conservatism of his alternative to the Catholic mass. Luther's service, however, included congregational singing of hymns and psalms in German, as well as of parts of the liturgy, including Luther's unison setting of the Creed. To reach the simple people and the young, Luther incorporated religious instruction into the weekday services in the form of the catechism. He also provided simplified versions of the baptism and marriage services.
answer:

When did Luther write  a German mass?