How many noble prize categories are there?

How many noble prize categories are there?

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Explanation

The noble prize is awarded in 6 areas

Since 1901, the Nobel Prize has been awarded in the fields of
1.       Physics

2.       Chemistry

3.       Physiology/Medicine

4.       Literature

5.       Peace

6.       economics.

while a memorial prize in economic sciences was added in 1968.

The first Noble Prize was awarded on 10th December 1901 in Stockholm, Sweden.