Question: Caitlin Pike was a character in JAG that was portrayed by an actress who appeared in Pretty Little Liars, and was a dancer in what form of dance?

Context paragraphs:
Caitlin Pike: Commander Caitlin "Kate" Pike, USN (JAGC) was a character in the military TV series "JAG" and was portrayed by Andrea Parker.  She appeared in episodes "A New Life", "A New Life Part 2", "Brig Break", "Ares" and "Touch and Go".  Archive footage was used in episodes "Lifeline" and "Shifting Sands".

Pretty Little Liars (novel): Pretty Little Liars is the first book in the "Pretty Little Liars" series by Sara Shepard.  It tells the story of four girls - Hanna, Aria, Emily and Spencer - after the disappearance of their clique leader, Alison.  The book was written for the book packaging company Alloy Entertainment, the idea originally developed as a TV series.

Andrea Parker: Andrea Nicole Parker (born March 8, 1970) is an American television actress and former ballet dancer.  She is known for her roles on "ER", "The Pretender", "Less than Perfect", "Desperate Housewives", and "Pretty Little Liars".

Mary Drake: Mary Drake is a fictional character created by I. Marlene King and portrayed by Andrea Parker in the American television series "Pretty Little Liars".  "Pretty Little Liars" is a television adaptation of the novel series of the same name written by Sara Shepard, in which the antagonist Alison DiLaurentis has an identical twin sister, Courtney DiLaurentis.  It is believed that Mary is the on-screen counterpart of Courtney, though her recent characterization is more in line with Alison.  The character makes her first official introduction during the sixth-season finale "Hush, Hush, Sweet Liars".  The Liars discover that Mary is Jessica DiLaurentis' identical twin sister, a former patient at Radley Sanitarium who is Charlotte's biological mother.  In "The DArkest Knight", Drake is also revealed to be Spencer Hastings' biological mother.  During "Till Death Do Us Part", the elusive A.D. is revealed to be Alex Drake, Spencer's younger identical twin sister.  Alex believed the Liars knew who was accountable for Charlotte's murder and was also set on physically replacing Spencer due to being jealous of the life that she had.

Rosewood, Pennsylvania: Rosewood is the fictional setting for both the "Pretty Little Liars" book series and the "Pretty Little Liars" television series.  The fictional city is suggested to be loosely based on Rosemont, Pennsylvania.

List of Pretty Little Liars episodes: "Pretty Little Liars" is a TV series which premiered on ABC Family on June 8, 2010.  Developed by I. Marlene King, the series is based on the "Pretty Little Liars" book series by Sara Shepard.  The series follows the lives of four girls, Aria Montgomery, Hanna Marin, Emily Fields, and Spencer Hastings, whose clique falls apart after the disappearance of their leader, Alison DiLaurentis.  One year later, the estranged friends are reunited as they begin receiving messages from a mysterious figure named "A" who threatens to expose their deepest secrets, including ones they thought only Alison knew.

Pretty Little Liars: The Perfectionists: Pretty Little Liars: The Perfectionists is a upcoming American teen drama television series developed by I. Marlene King, loosely based on the popular book series "The Perfectionists" written by Sara Shepard.  A second spin-off of "Pretty Little Liars" after "Ravenswood", Freeform greenlit the series on September 25, 2017.

Ravenswood (TV series): Ravenswood was an American supernatural teen drama, mystery-thriller television series created by I. Marlene King, Oliver Goldstick and Joseph Dougherty.  A first spin-off of "Pretty Little Liars", ABC Family green lit the series on March 26, 2013.  It premiered on October 22, 2013, following the "Pretty Little Liars" Halloween episode.  The series began filming on August 21, 2013, in New Orleans, Louisiana.

Aeriél Miranda: Aeriél Christine Miranda (born April 3, 1992) is an American actress.  She is best known for her recurring role as Shana Fring on the ABC Family series, "Pretty Little Liars" (2013–2014).  She was first introduced as Shana on the "Pretty Little Liars" web series, "Pretty Dirty Secrets", prior to appearing on "Pretty Little Liars".  Miranda also had a recurring role as Lana on the ABC Family series "The Nine Lives of Chloe King" (2011).

Charlotte Drake: Charlotte Drake is a fictional character in "Pretty Little Liars", an American mystery drama television series based on the homonymous novel series written by Sara Shepard.  Charlotte is a character that only appears in the television series and is portrayed by Vanessa Ray.  The character is also featured in the "Pretty Little Liars" spin-off "Pretty Dirty Secrets".

Supporting paragraphs: Caitlin Pike Andrea Parker
Answer: ballet