The wild caper berry found in Rajasthan is Ker. It is a popular ingredient in Rajasthani cuisine, often used in pickles and curries.
- Ver is a type of wild berry but not commonly found in Rajasthan.
- Sangri is another ingredient from Rajasthan, but it is different from Ker. It is used in making traditional Rajasthani dishes like Sangri ki sabzi.
- Kachri is a wild vegetable from Rajasthan but is not a caper berry.
Thus, the correct answer is Ker.