Which of the following presidents was awarded the Nobel Peace Prize in 2016 for efforts to end the long running civil war in Colombia?

Introduction / Context:
The Nobel Peace Prize recognises individuals and organisations that have made significant contributions toward peace, conflict resolution, and human rights. In 2016, the prize went to a serving president who worked to end a decades long civil war in his country. This question asks you to connect that peace process, which involved negotiations with the FARC rebel group in Colombia, to the correct leader, Juan Manuel Santos.

Given Data / Assumptions:
- The category is the Nobel Peace Prize for the year 2016.
- The award was given to a president for efforts to end a civil war in Colombia.
- Options include Raffel Korea, Juan Manuel Santos, Donald Trump, Alexander Lukashenko, and Barack Obama.
- We assume basic knowledge of world leaders and major peace agreements reported in the news.

Concept / Approach:
The core idea is matching key world events with the right leaders and awards. The Colombian government under President Juan Manuel Santos negotiated a peace agreement with the FARC guerrilla group, seeking to bring an end to one of the longest running internal conflicts in modern history. The Nobel Committee recognised his resolute efforts to end the civil war. Barack Obama had already received the Nobel Peace Prize in 2009, while Donald Trump and Alexander Lukashenko did not receive this award. Raffel Korea is not a recognised spelling of any major president in this context and serves only as a distractor.

Step-by-Step Solution:
Step 1: Note that the prize is the Nobel Peace Prize 2016, specifically linked to the Colombian peace process.
Step 2: Recall that the Colombian president who led talks with FARC was Juan Manuel Santos.
Step 3: Eliminate Donald Trump and Alexander Lukashenko because they are associated with different political narratives and have not been Nobel Peace laureates.
Step 4: Remember that Barack Obama received the Nobel Peace Prize much earlier, in 2009, not in 2016.
Step 5: Conclude that the only option matching the 2016 Peace Prize is Juan Manuel Santos.

Verification / Alternative check:
A simple revision trick is to list recent Nobel Peace Prize winners: 2014 for child rights, 2016 for Colombia peace process, and so on. Under 2016, you should associate Colombia, FARC negotiations, and the name Juan Manuel Santos. This cross reference confirms that he is the correct choice among the listed presidents.

Why Other Options Are Wrong:
Raffel Korea appears to be a distractor and is not the documented name of a Nobel Peace Prize winning president related to Colombia.

Donald Trump has not received the Nobel Peace Prize, and his presidency is unrelated to the Colombian peace accord mentioned here.

Alexander Lukashenko is the long serving leader of Belarus, and there is no Nobel Peace Prize in 2016 or any other year associated with him.

Barack Obama did receive a Nobel Peace Prize, but it was in 2009, not 2016, and therefore does not match the year and context asked in the question.

Common Pitfalls:
One common mistake is confusing the year 2016 with earlier Nobel Peace recognitions or mixing up leaders due to heavy media coverage. Some candidates also wrongly assume that any well known president, such as Donald Trump or Barack Obama, might fit, without thinking about the specific conflict and country mentioned. Always tie the award to the exact event, in this case the peace deal with FARC in Colombia.

Final Answer:
The president who received the Nobel Peace Prize in 2016 for efforts to end the Colombian civil war is Juan Manuel Santos.