The first transgenic cow was developed in:

The correct answer is Option (3) → 1997

Transgenic animals carry a foreign gene in their DNA. The first transgenic cow, Rosie, was produced in 1997. Her milk contained the human protein alpha-lactalbumin (2.4 grams per litre). This made the milk nutritionally more balanced for human babies than natural cow’s milk.

NCERT Extract:
Transgenic Animals – …