Choose the idiom/phrase that can substitute the highlighted group of words meaningfully.
I had to wake up in the middle of the night to go to the toilet.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Answer the call of nature.
"Answer the call of nature" is an idiom referring to the need to use the toilet or bathroom.
Hence, option 2 is correct.