Question: That's My Mommy, released in which year, is an one reel animated "Tom and Jerry" short directed and produced by William Hanna and Joseph Barbera?

Context paragraphs:
Smarty Cat: Smarty Cat is the 95th one reel animated "Tom and Jerry" short, created in 1955, and released on October 14, 1955 by Metro-Goldwyn-Mayer.  The cartoon was directed by William Hanna and Joseph Barbera and produced by Fred Quimby, William Hanna and Joseph Barbera with music by Scott Bradley.  "Smarty Cat" was animated by Kenneth Muse, Michael Lah, Ed Barge and Irven Spence, with backgrounds by Vera Ohman and the layouts by Richard Bickenbach.  It integrates footage from previous shorts into the plot.  The name is the pun on the phrase "smarty pants."  While most "Tom and Jerry" cartoons end with their ending titles, it is the only "Tom and Jerry" cartoon to not end with its ending title but with an MGM cartoon ending title.

That's My Mommy: That's My Mommy is a 1955 one reel animated "Tom and Jerry" short directed and produced by William Hanna and Joseph Barbera with music by Scott Bradley.

Pup on a Picnic: Pup on a Picnic is a 1955 one reel animated "Tom and Jerry" short directed by William Hanna and Joseph Barbera and produced by Fred Quimby with music by Scott Bradley.  The cartoon was animated by Ray Patterson, Kenneth Muse, Ed Barge and Irven Spence, with backgrounds by Robert Gentle.  It was released on April 30, 1955 by Metro-Goldwyn-Mayer.

Posse Cat: Posse Cat is a 1954 one reel animated "Tom and Jerry" short.  As with all "Tom and Jerry" cartoons at the time, it was directed by William Hanna and Joseph Barbera and produced by Fred Quimby with music by Scott Bradley.  The short was animated by Irven Spence, Ed Barge, Kenneth Muse and Ray Patterson, the usual quartet of animators who dealt with the vast majority of "Tom and Jerry" shorts in the Hanna and Barbera era.  The backgrounds was credited to Robert Gentle.  It was released on January 30, 1954 by Metro-Goldwyn-Mayer.

Tom's Photo Finish: Tom's Photo Finish is a 1957 one reel animated "Tom and Jerry" short directed and produced by William Hanna and Joseph Barbera with music by Scott Bradley.  The cartoon was animated by Kenneth Muse, Bill Schipek, Lewis Marshall, Jack Carr, Herman Cohen and Ken Southworth, with backgrounds by Robert Gentle and layouts by Richard Bickenbach.  It was released on November 1, 1957 by Metro-Goldwyn-Mayer.

Busy Buddies: Busy Buddies is a 1956 one reel animated "Tom and Jerry" short directed and produced by William Hanna and Joseph Barbera with music by Scott Bradley.  The cartoon was animated by Irven Spence, Lewis Marshall, Kenneth Muse and Ed Barge, with backgrounds by Robert Gentle and layouts by Richard Bickenbach.  "Busy Buddies" was the 100th cartoon of the 118 that Hanna and Barbera directed during their tenure at MGM.  It was released on May 4, 1956 by Metro-Goldwyn-Mayer and also the first cartoon to feature Jeannie the babysitter (voiced by Janet Waldo) and a mischievous baby that kept crawling off, both of whom would return in the 114th and final cartoon, "Tot Watchers".

The Flying Sorceress: The Flying Sorceress is a 1956 one reel animated "Tom and Jerry" short directed and produced by William Hanna and Joseph Barbera with music by Scott Bradley.  The cartoon was animated by Kenneth Muse, Ed Barge, Irven Spence and Lewis Marshall, with backgrounds by Robert Gentle and layouts by Richard Bickenbach.  It was produced in CinemaScope and released to theatres on January 27, 1956 by Metro-Goldwyn Mayer.

Tom and Chérie: Tom and Chérie is a 1955 one reel animated "Tom and Jerry" short directed by William Hanna and Joseph Barbera and produced by Fred Quimby with music by Scott Bradley.  It was the third (of four) cartoons in the "Mouseketeer" series of cartoons to take place in France, the first of which, "The Two Mouseketeers" (1952) won an Academy Award, and the second, "Touché, Pussy Cat! " (1954) received an Academy Award nomination.

The Vanishing Duck: The Vanishing Duck is a 1958 one reel animated "Tom and Jerry" short, directed and produced by William Hanna and Joseph Barbera with music by Scott Bradley.  The cartoon was animated by Lewis Marshall, Kenneth Muse, Carlo Vinci and James Escalante, with backgrounds by Robert Gentle and layouts by Richard Bickenbach.  Red Coffey, June Foray and George O'Hanlon provided the voices for this film.  It was released on May 2, 1958 by Metro-Goldwyn-Mayer and marks the final appearance of Quacker, who appeared in seven previous "Tom and Jerry" shorts.  As such, "The Vanishing Duck" is the antepenultimate "Tom and Jerry" short of the Hanna and Barbera era.  O'Hanlon would go on to star as the voice of George Jetson on the ABC-TV animated series, "The Jetsons," also produced by Hanna-Barbera four years later.  The cartoon has a similar premise to an earlier film, The Invisible Mouse, released in 1947.

Tom and Jerry: Tom and Jerry is an American animated series of short films created in 1940, by William Hanna and Joseph Barbera.  It centers on a rivalry between its two title characters, Tom and Jerry, and many recurring characters, based around slapstick comedy.

Supporting paragraphs: That's My Mommy Tom and Jerry
Answer: 1955