Answer : 4. "Harsh Vardhan"
Explanation :

Answer: D) Harsh Vardhan Explanation: The Union Minister for Science & Technology Dr. Harsh Vardhan has launched a mobile app “Celebrating Yoga” in New Delhi to connect people through Yoga for scientific healthy living. The mobile app has been developed by Department of Science & Technology on the occasion of International Yoga Day (IYD) 2017. The aim of the app is to popularize Yoga and encourage people to practice yoga for a scientifically healthy living.