question: What American carrier joined the USS Yorktown to stop the Japanese attack on Port Moresby in 1942 ?
answer: USS Lexington
turker_answer: The USS Lexington joined the USS Yorktown to stop the Japanese attack on Port Moresby in 1942 .
rule-based: USS Lexington joined the USS Yorktown to stop the Japanese attack on Port Moresby in 1942 .