Identifying the Odd One Out among the options provided:

To find the odd one out among the given options - Ganga, Hirakud, Yamuna, Sutlej, and Krishna - we need to analyze the characteristics or properties associated with each option and identify the one that does not fit the pattern.

1. Ganga:
- Ganga is the longest river in India and one of the most sacred rivers in Hinduism.
- It originates from the Gangotri Glacier in the Indian Himalayas and flows through northern India and Bangladesh before emptying into the Bay of Bengal.
- It is associated with the cities of Haridwar, Varanasi, and Kolkata.

2. Hirakud:
- Hirakud is a name that does not represent a river.
- It is a reservoir located in Odisha, India, formed by the damming of the Mahanadi River.
- The Hirakud Dam is one of the longest major earthen dams in the world and serves various purposes like irrigation, hydroelectric power generation, and flood control.

3. Yamuna:
- The Yamuna is the second-largest tributary river of the Ganga and flows through northern India.
- It originates from the Yamunotri Glacier in the upper Himalayas and passes through Delhi before merging with the Ganga at Allahabad.
- It holds religious significance, with various temples and ghats along its banks.

4. Sutlej:
- The Sutlej is a river that originates in Tibet and flows through India and Pakistan.
- It is one of the major tributaries of the Indus River and is important for irrigation and hydroelectric power generation.
- It passes through the states of Himachal Pradesh and Punjab before entering Pakistan.

5. Krishna:
- The Krishna is one of the longest rivers in India and flows through the states of Maharashtra, Karnataka, and Andhra Pradesh.
- It originates in the Western Ghats and empties into the Bay of Bengal.
- It is associated with various mythological stories and plays a crucial role in irrigation and hydropower generation.

Based on the analysis, the odd one out among the given options is "Hirakud" (option B). It does not represent a river but rather a reservoir formed by the damming of the Mahanadi River. The other options, Ganga, Yamuna, Sutlej, and Krishna, are all major rivers in India with their unique characteristics and significance.