Step 1 : Introduction to the question "Who is the only actress to have won an Oscar for playing a man?"
...Linda Hunt...She debuted onscreen in Robert Altman's Popeye (1980), but it was her second film, The Year of Living Dangerously (1983), that made her internationally known; for her portrayal of a male Indonesian dwarf, she won a Best Supporting Actress Oscar. It was the first time an actor won an Oscar for portraying a character of the opposite sex. Hunt has also had a successful television career. Her television appearances include recurring roles as Judge Zoey Hiller on The Practice and as Dr. Claire Bryson on Without a Trace. Since 2009, she has co-starred on the CBS show NCIS: Los Angeles.
Step 2 : Answer to the question "Who is the only actress to have won an Oscar for playing a man?"
Please let us know as comment, if the answer is not correct!