Who coached the athlete who is often called "queen of Indian track and field" and Payyoli Express?
O. M. Nambiar: O. M. Nambiar (born 1932) is an Indian athletics coach who was awarded Dronacharya award in 1985. O. M. Nambiar:  He coached the well known Indian athlete P. T. Usha. P. T. Usha:  She is often called the "queen of Indian track and field". P. T. Usha:  She is nicknamed as the Payyoli Express.
O. M. Nambiar