Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Title | Role | Leading Lady | Director |
| --- | --- | --- | --- | --- |
| 1940.0 | Johnny Apollo | Bob Cain (Johnny Apollo) | Dorothy Lamour | Henry Hathaway |
| 1940.0 | Brigham Young | Jonathan Kent | Linda Darnell | Henry Hathaway |
| 1940.0 | The Mark of Zorro | Don Diego Vega / Zorro | Linda Darnell | Rouben Mamoulian |
| 1941.0 | Blood and Sand | Juan Gallardo | Linda Darnell | Rouben Mamoulian |
| 1941.0 | Blood and Sand | Juan Gallardo | Rita Hayworth | Rouben Mamoulian |
| 1941.0 | A Yank in the R.A.F. | Tim Baker | Betty Grable | Henry King |
| 1942.0 | Son of Fury: The Story of Benjamin Blake | Benjamin Blake | Gene Tierney | John Cromwell |
| 1942.0 | Son of Fury: The Story of Benjamin Blake | Benjamin Blake | Frances Farmer | John Cromwell |
| 1942.0 | This Above All | Clive Briggs | Joan Fontaine | Anatole Litvak |
| 1942.0 | The Black Swan | Jamie Waring | Maureen O'Hara | Henry King |
| 1943.0 | Crash Dive | Lt. Ward Stewart | Anne Baxter | Archie Mayo |
| 1946.0 | The Razor's Edge | Larry Darrell | Gene Tierney | Edmund Goulding |
| 1947.0 | Nightmare Alley | Stanton Carlisle | Joan Blondell | Edmund Goulding |
| 1947.0 | Captain from Castile | Pedro De Vargas | Jean Peters | Henry King |
| 1948.0 | The Luck of the Irish | Stephen Fitzgerald | Anne Baxter | Henry Koster |
| 1948.0 | That Wonderful Urge | Thomas Jefferson Tyler | Gene Tierney | Robert B. Sinclair |
| 1949.0 | Prince of Foxes | Andrea Orsini | Wanda Hendrix | Henry King |
Question:
Who is the leading lady in a yank in the r.a.f.?
Answer:
Betty Grable