In 1997, the first transgenic cow, Rosie, produced human protein-enriched milk. The milk contained the _______ and was nutritionally a more balanced product for human babies than natural cow-milk.

Human alpha-lactalbumin

The correct answer is Option (3) → Human alpha-lactalbumin 

Medicines required to treat certain human diseases can contain biological products, but such products are often expensive to make. Transgenic animals that produce useful biological products can be created by the introduction of the portion of DNA (or genes) which codes for a particular product such as human protein (α-1-antitrypsin) used to treat emphysema. Similar attempts are being made for treatment of phenylketonuria (PKU) and cystic fibrosis. In 1997, the first transgenic cow, Rosie, produced human protein-enriched milk (2.4 grams per litre). The milk contained the human alpha-lactalbumin and was nutritionally a more balanced product for human babies than natural cow-milk.