I want to know the answer to the following question:
Padma Vibhushan E. Sreedharan was popularly known by what nickname?
All the background I'm provided with is that "The Delhi Metro project was spearheaded by Padma Vibhushan E. Sreedharan, the Managing Director of DMRC and popularly known as the "Metro Man" of India.". Is that enough to answer the question?