TASK DEFINITION: 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.
PROBLEM: Context: FreeBSD is a free Unix-like operating system descended from Research Unix via the Berkeley Software Distribution (BSD).
Question: The FreeBSD is based upon what?

SOLUTION: berkeley software distribution

PROBLEM: Context: In week 4, the Lions traveled across Lake Michigan to Green Bay, Wisconsin to play division rivals the Green Bay Packers. The Packers started the scoring in the first quarter with a 29-yard TD catch by Donald Driver from Aaron Rodgers. The Lions tied it up in the second quarter with a 23-yard TD catch by Calvin Johnson. The Packers took the lead with a 13-yard catch by Jermichael Finley. They added to their lead 17-yard catch by Greg Jennings. The Lions responded just before halftime with a 21-yard catch by Calvin Johnson. Just after the break, the Packers' Charles Woodson returned an interception for a touchdown. The Lions attempted a comeback with 4 consecutive field goals: from 39 yards and 52 yards in the 3rd quarter, and later from 49 yards and 24 yards in the 4th. With the loss, not only did the Lions fall to 0-4, but it also marked their 19th consecutive loss in Wisconsin.
Question: Who caught the second longest touchdown reception of the game?

SOLUTION: calvin johnson

PROBLEM: Context: Autosomal dominant facioscapulohumeral muscular dystrophy (FSHD) has an unusual pathogenic mechanism. FSHD is caused by deletion of a subset of D4Z4 macrosatellite repeat units in the subtelomere of chromosome 4q. Recent studies provide compelling evidence that a retrotransposed gene in the D4Z4 repeat, DUX4, is expressed in the human germline and then epigenetically silenced in somatic tissues. In FSHD, the combination of inefficient chromatin silencing of the D4Z4 repeat and polymorphisms on the FSHD-permissive alleles that stabilize the DUX4 mRNAs emanating from the repeat result in inappropriate DUX4 protein expression in muscle cells. FSHD is thereby the first example of a human disease caused by the inefficient repression of a retrogene in a macrosatellite repeat array.
Question: Which disease is associated with the ectopic expression of the protein encoded by the gene DUX4?

SOLUTION:
fshd