In modern history, who is popularly known by the humanitarian title "Saint of the Gutters" for her dedicated work among the poorest of the poor?

Introduction / Context:
The title "Saint of the Gutters" is a very famous honorary description given in modern history for a person who devoted life to serving the poorest, sickest and most neglected people. This question checks knowledge of famous personalities, their humanitarian work and important sobriquets often used in general studies and competitive examinations. Knowing such titles helps in quickly connecting names with their contributions.

Given Data / Assumptions:
- The question asks about the individual known as "Saint of the Gutters".
- The context is humanitarian and charitable work among the poorest sections of society.
- The options include leading Indian and international social reformers and activists.
- We assume the exam expects the most widely accepted and historically used title from standard GK sources.

Concept / Approach:
To answer this, we recall which personality is internationally recognised with this exact title. The phrase "gutters" hints at work in filthy, neglected and extremely poor neighbourhoods. The person connected with this description worked in slums, tended to the dying, leprosy patients and the abandoned. General knowledge books and school texts often associate this phrase with a single Nobel Peace Prize laureate who served in Kolkata and across the world through a religious congregation of sisters.

Step-by-Step Solution:
Step 1: Read the title phrase "Saint of the Gutters" carefully and link it with work among the poorest and sick. Step 2: Recall which option is globally known for serving the destitute in Kolkata and other places through charitable homes. Step 3: Associate this work with Mother Teresa, founder of the Missionaries of Charity. Step 4: Check other options and confirm that none of them are commonly described by this specific title. Step 5: Conclude that Mother Teresa is the correct answer and mark that option.

Verification / Alternative check:
An alternative check is to remember that Mother Teresa received the Nobel Peace Prize for work with the poorest of the poor and was later canonised as a saint by the Catholic Church. Popular biographies, documentaries and competitive exam books repeatedly describe her as "Saint of the Gutters" because she chose to live and serve among people in slums and on streets. No such repeated description exists in standard texts for the other personalities listed here in relation to that exact title.

Why Other Options Are Wrong:
B. R. Ambedkar was a great jurist, social reformer and chief architect of the Constitution of India, but he is not known as "Saint of the Gutters".
Mahatma Gandhi is known as the Father of the Nation and associated with truth and non violence, not with this particular phrase.
Baba Amte did outstanding work for leprosy patients and social causes, but his commonly used titles are different and do not include "Saint of the Gutters".
Hence, only Mother Teresa matches the famous title in the question.

Common Pitfalls:
A common error is to choose Baba Amte because he also worked among leprosy patients and the poor, which may superficially resemble gutter related work. Another confusion is selecting Mahatma Gandhi simply because he is a very famous humanitarian figure from Indian history. Students sometimes answer by emotional association rather than recalling exact titles. To avoid mistakes, always relate the exact phrase in the question with the correct personality as used in standard GK material.

Final Answer:
Mother Teresa