TASK DEFINITION: In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
PROBLEM: When does crossing over occur in prophase 1?

SOLUTION: pachytene stage

PROBLEM: Who plays chakal in the book of life?

SOLUTION: Daniel Anthony Navarro

PROBLEM: Who wrote the ballad of the green beret?

SOLUTION:
Robin Moore, Staff Sgt. Barry Sadler