Question: The episode  "I Married Marge" from "The Simpsons," Marge is worried she may be pregnant and visits this doctor who is voiced by whom?

Context paragraphs:
I Don't Wanna Know Why the Caged Bird Sings: "I Don't Wanna Know Why the Caged Bird Sings" is the fourth episode of "The Simpsons"<nowiki>'</nowiki> nineteenth season.  It first aired on the Fox network in the United States on October 14, 2007.  For the second time in the series, Marge helps a prison assailant.  Marge meets Dwight (Steve Buscemi), a man who attempts to rob the bank the two are in.  Marge promises that she would visit him in prison, should he turn himself in, but too frightened to go into the prison, she breaks her promise.  It was written by Dana Gould and directed by Bob Anderson.  Steve Buscemi makes his second guest appearance on the show, (originally appearing as himself in "Brake My Wife, Please") though this time he voiced a character, Dwight.  Ted Nugent has a voice cameo.  Julia Louis-Dreyfus makes a surprise guest return as Snake's girlfriend Gloria, who originally appeared in "A Hunka Hunka Burns in Love".  During its first airing, the episode originally garnered 8.8 million viewers, higher than the previous episode.

There's Something About Marrying: "There's Something About Marrying" is the tenth episode of the sixteenth season of "The Simpsons".  In the episode, Springfield legalizes same-sex marriage to increase tourism.  After becoming a minister, Homer starts to wed people to make money.  Meanwhile, Marge's sister Patty comes out as a lesbian and reveals that she is going to marry a woman named Veronica.  Marge originally disapproves of this, making Patty frustrated.  When Marge accidentally discovers that Veronica is a man cross-dressed as a woman, she decides to keep quiet about it knowing that Patty will be marrying a man.  However, at the ceremony, she is so moved by Patty's vow that she is forced to reveal Veronica's secret.  After the ceremony is abruptly cancelled, Marge tells Patty that she now accepts her sexuality.

Dr. Hibbert: Dr. Julius M. Hibbert, usually referred to as Dr. Hibbert, is a recurring character on the animated series "The Simpsons".  His speaking voice is provided by Harry Shearer and his singing voice was by Thurl Ravenscroft, and he first appeared in the episode "Bart the Daredevil".  Dr. Hibbert is Springfield's most prominent and competent doctor, though he sometimes makes no effort to hide or makes light of his high prices.  Dr. Hibbert is very good-natured, and is known for finding a reason to laugh at nearly every situation.

Three Gays of the Condo: "Three Gays of the Condo" is the seventeenth episode of the fourteenth season of "The Simpsons".  It originally aired on the Fox network in the United States on April 13, 2003.  The episode was written by Matt Warburton and directed by Mark Kirkland.  The title is a pun on the 1975 film "Three Days of the Condor".  In the episode Homer finds out that while dating, Marge did not enjoy going to Moe's Tavern while Homer got drunk.  Homer notices two days later that Marge is pregnant with Bart, so he thinks that is why she stayed with him.  Upset, Homer moves in with two gay guys, Grady and Julio.

Marge on the Lam: "Marge on the Lam" is the sixth episode of "The Simpsons"<nowiki>'</nowiki> fifth season.  It originally aired on the Fox network in the United States on November 4, 1993.  When Marge invites her neighbor Ruth Powers to attend the ballet with her, the two become friends and begin to go out, making Homer jealous as he wants Marge to spend time with him.  Ruth and Marge agree to remain friends but not go out together after a large police pursuit with Chief Wiggum.  It was written by Bill Canterbury and directed by Mark Kirkland.  Phil Hartman, Pamela Reed and George Fenneman guest star.

The Way We Was: "The Way We Was" is the twelfth episode of "The Simpsons"<nowiki>'</nowiki> second season.  It originally aired on the Fox network in the United States on January 31, 1991.  In the episode, Marge tells the story of how she and Homer first met and fell in love.  Flashing back to 1974, we see how Homer falls in love with Marge in high school and tries to get close to her by enlisting her as his French tutor.  After several hours of verb conjugation, Marge falls for Homer too, only to become enraged when he admits that he is not a French student.  Marge rejects Homer's invitation to the prom and goes with Artie Ziff.  Artie turns out to be a terrible date and Marge realizes that it is Homer she really wants.

I Married Marge: "I Married Marge" is the twelfth episode of "The Simpsons"<nowiki>'</nowiki> third season.  It originally aired on the Fox network in the United States on December 26, 1991.  In the episode, Marge worries that she may yet again be pregnant and drives to Dr. Hibbert's office.  While anxiously waiting, Homer begins to tell Bart, Lisa, and Maggie the story of how he and Marge got married and how Bart was born.

The War of the Simpsons: "The War of the Simpsons" is the twentieth episode of "The Simpsons"<nowiki>'</nowiki> second season.  It originally aired on the Fox network in the United States on May 2, 1991.  In the episode, Homer gets drunk at a party and embarrasses his wife Marge, so she decides to sign them up for a marriage counseling retreat.  Homer finds out that the retreat will be held near a lake and packs his fishing equipment, despite Marge telling him that all they will be doing is resolving their differences.  At the lake the next morning, Homer tries to sneak away to go fishing, but Marge catches him and he takes a walk instead.  On the dock, Homer grabs hold of a fishing pole only to be yanked onto a small rowboat by the fish.  When he notices an upset Marge is looking at him, he immediately lets the fish go to prove his love for her.

Colonel Homer: "Colonel Homer" is the twentieth episode of "The Simpsons"<nowiki>'</nowiki> third season.  It originally aired on the Fox network in the United States on March 26, 1992.  In the episode, Homer embarrasses his wife Marge at a movie theater, leading to a big argument between the two.  Homer, angry at Marge, visits a redneck bar in the middle of the night where he meets a waitress named Lurleen Lumpkin, a talented singer.  Homer becomes Lurleen's manager and tries to make her famous, but he does not appear aware that Lurleen has fallen in love with him.  With Marge already upset and thinking Homer is cheating on her, he must decide on the importance of his marriage after Lurleen makes romantic advances toward him.

Marge in Chains: "Marge in Chains" is the 21st episode of "The Simpsons"<nowiki>'</nowiki> fourth season.  It originally aired on the Fox network in the United States on May 6, 1993.  In the episode, Marge is arrested for shoplifting after forgetting to pay for an item at the Kwik-E-Mart.  The family hires attorney Lionel Hutz to defend her at trial, but she is found guilty and sentenced to 30 days imprisonment.  Homer, and the rest of the family have trouble coping without Marge.  The townspeople start a riot when an annual bake sale missing Marge fails to raise enough money for a statue of Abraham Lincoln and they have to settle for a statue of Jimmy Carter.  Mayor Quimby has Marge released from jail in order to save his career and quell the riot.

Supporting paragraphs: I Married Marge Dr. Hibbert
Answer: Harry Shearer