You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

Let me give you an example: Which part of a bicycle BEST moves in a circle? 
 (A) Seat (B) Frame (C) Foot pedal (D) Kickstand
The answer to this example can be: C
Here is why: Seat, frame and Kickstand are static parts of the bicycle, even when bicycle moves. Foot pedal moves in a circle as bicycle moves.

OK. solve this:
A wire is wrapped around a metal nail and connected to a battery. If the battery is active, the nail will  
 (A) vibrate. (B) create sound. (C) produce heat. (D) become magnetic.
Answer:
D
You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

Let me give you an example: Which part of a bicycle BEST moves in a circle? 
 (A) Seat (B) Frame (C) Foot pedal (D) Kickstand
The answer to this example can be: C
Here is why: Seat, frame and Kickstand are static parts of the bicycle, even when bicycle moves. Foot pedal moves in a circle as bicycle moves.

OK. solve this:
A wire is wrapped around a metal nail and connected to a battery. If the battery is active, the nail will  
 (A) vibrate. (B) create sound. (C) produce heat. (D) become magnetic.
Answer:
user
D
assistant
You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

Let me give you an example: Which part of a bicycle BEST moves in a circle? 
 (A) Seat (B) Frame (C) Foot pedal (D) Kickstand
The answer to this example can be: C
Here is why: Seat, frame and Kickstand are static parts of the bicycle, even when bicycle moves. Foot pedal moves in a circle as bicycle moves.

OK. solve this:
A wire is wrapped around a metal nail and connected to a battery. If the battery is active, the nail will  
 (A) vibrate. (B) create sound. (C) produce heat. (D) become magnetic.
Answer:
D