Question: When was the retired Indian track and field athlete coached by O. M. Nambiar born? 

full_context: Document 1: Satheesha Rai: Satheesha Rai is an Indian weightlifter and Olympian from Mangalore, Karnataka. He is also a recipient of the Arjuna Award given in 1999. He won a gold medal and two silver medals in the 1998 Commonwealth Games. He also won two gold medals and a bronze medal in 2002 Commonwealth Games but the medal he won in 2002 was stripped because he tested positive for intaking a banned substance. Rai pleaded innocence and stated, "I have participated in over 16 International events including the Olympics and the World championships the Asian Games, the Commonwealth Games besides a host of Asian Weightlifting championships and SAF Games. And in all these Games too tests are mandatory and I have come through clean. Also just before the teams left for Manchester, Sports Authority of India (SAI) conducted tests thrice and unless it's negative we are informed,". but was subsequently served a life ban
Document 2: Sanjeeva Kumar Singh: Sanjeeva Kumar Singh is an Indian archery coach from Jharkhand. He is Chief at Tata Football Academy and Sports, Tata Steel. He is the recipient of Arjuna Award and Dronacharya Award by the Government of India.
Document 3: Pranitha Vardhineni: Pranitha Vardhineni was introduced to archery during her school years at the Rural Development Foundation's Kalleda Rural School in Warangal District, Telangana State, India. It was from here that she won a Bronze medal at the National Sub-Junior Archery Championships in 2004. This notable win led to her selection into the prestigious Tata Archery Academy in Jamshedpur, India.
Document 4: K. M. Binu: Kalayathumkuzhi Mathews Binu (born 20 December 1980) is an Indian track and field athlete from Kerala who specializes in 400 metres and 800 metres. He holds the current 400 metres national record of 45.48 s set at the 2004 Athens Olympics on 20 August 2004. He broke the 44-year-old Olympics mark (by an Indian) held by Milkha Singh who set an Indian National Record with a timing of 45.73 s at the 1960 Rome Olympics. He and his elder sister K. M. Beenamol made history when they became the first Indian siblings to win medals in a major international competition. They won medals at the Busan Asian Games (2002). While Binu won the men's 800 metres silver, his sister won the gold medal in the women's event. Binu received the Arjuna Award for the year 2006 for his achievements in the Indian athletics.
Document 5: O. M. Nambiar: O. M. Nambiar (born 1932) is an Indian athletics coach who was awarded Dronacharya award in 1985. He coached the well known Indian athlete P. T. Usha. He hails from Kerala state.
Document 6: Mayookha Johny: Mayookha Johny (born 9 April 1988) is an Indian track and field athlete from Kerala who specialises in long jump and triple jump. She holds the current Indian National record for triple jump with a mark of 14.11 m (46 ft floor(((14.11)*3.28084)−(floor((14.11)*3.28084)) *12) in) . She is the first Indian woman to cross the fourteen-metre mark.
Document 7: Mercy Kuttan: Mercy Kuttan (born 1 January 1960) is a former Indian track and field athlete. She was the first Indian woman longjumper to cross six meters. In 1989, Mercy received Arjuna Award for her contribution to the Indian athletics.
Document 8: Bill Bowerman: William Jay "Bill" Bowerman (February 19, 1911 – December 24, 1999) was an American track and field coach and co-founder of Nike, Inc. Over his career, he trained 31 Olympic athletes, 51 All-Americans, 12 American record-holders, 22 NCAA champions and 16 sub-4 minute milers. During his 24 years as coach at the University of Oregon, the Ducks track and field team had a winning season every season but one, attained 4 NCAA titles, and finished in the top 10 in the nation 16 times. As co-founder of Nike, he invented some of their top brands, including the "Cortez" and "Waffle Racer", and assisted in the company moving from being a distributor of other shoe brands to one creating their own shoes in house.
Document 9: Valiyaveetil Diju: Valiyaveetil Diju (Malayalam: വലിയവീട്ടില്‍ ദിജു ; born 4 January 1981), also known as V. Diju, is an Indian badminton player from Kozhikode, Kerala. He, along with partner Jwala Gutta, is the current national mixed-doubles champions and the pair are currently ranked 7th in the world by Badminton World Federation. He is the winner of Arjuna Award 2014, given by the Ministry of Youth Affairs and Sports, government of India to recognize his outstanding achievement in National sports. He is also the winner of G. V. Raja awards, which is the highest government-level recognition for sports persons in Kerala. He is winner of Jimmy George award 2014.He is also winner of Vivekanandha sports excellence award 2014. He won the Youth excellence award also in 2014. He is only the second badminton player from the state, after Vimal Kumar, to represent India in Olympics.
Document 10: Santhi Soundarajan: Santhi Soundarajan (also spelled "Shanthi Soundararajan",Tamil: சாந்தி சௌந்திரராஜன் , born April 1981) is an Indian track and field athlete. She is the winner of 12 international medals for India and around 50 medals for her home state of Tamil Nadu. Shanthi Soundarajan is the first Tamil woman to win a medal at the Asian Games. She competes in middle distance track events. She was stripped of a silver medal won at the 2006 Asian Games after failing a sex verification test which disputed her eligibility to participate in the women's competition.
Document 11: Narayan Singh Rana: Narayan Singh Rana is an Indian politician and member of the Bharatiya Janata Party. Rawat was a member of the Uttar Pradesh Legislative Council from the Kumaon Division in Uttarakhand. He is father and first coach of an Indian shooter Jaspal Rana. He was first sports minister of the Uttarakhand from 2000-02. He also served Indo-Tibetan Border Police in 1967 and served in Jammu and Kashmir during the 1971 war and was also selected in the Special Protection Group in 1985. He also trains young shooter at Jaspal Rana Shooting Academy.
Document 12: P. T. Usha: Pilavullakandi Thekkeparambil Usha (born 27 June 1964), popularly known as P. T. Usha, is a retired Indian track and field athlete. She has been associated with Indian athletics since 1979. She is often called the "queen of Indian track and field". She is nicknamed as the Payyoli Express. Currently she runs the Usha School of Athletics at Koyilandy in Kerala.
Document 13: Vidya Pillai: Vidya Pillai (born 26 November 1978 in Trichy) is an Indian professional player of snooker. Vidya Pillai grew up in Chennai, Tamil Nadu. In 2011, after her wedding to Bangalore based architect MC Tilakraj she moved to Bangalore, Karnataka and is currently a domicile of the state. In recognition of her achievements, the Government of Karnataka has bestowed her with the prestigious Ekalavya award in 2016 for outstanding performance in Sports. She has won several International medals for India and recently in 2013 won the Gold medal in the IBSF World Team Snooker Championship, Gold in the IBSF Australian Women’s Ranking Snooker Championship in 2016 and was the first Indian woman to reach the finals of the WLBSA World Women's Snooker Championship in 2017 and won the Silver medal as well. She is also a 9-time winner of the National Championship Title. She is acclaimed to be the best Woman Snooker player in India.
Document 14: Natesan Srinivasan: Natesan Srinivasan (1919 – 1965) was a pioneer of aircraft design and aeronautics education in India. He made key contributions to aeronautics education and aviation development just as India emerged as an independent nation in 1947. He served as the Director of the Madras Institute of Technology from 1954 to 1959, where the future President of India, Abdul Kalam, was one of his students. His ideas, highlighted in his book, helped set up the vision for national aviation development in India. At the time of his untimely death, he was the project director for the AVRO project in Kanpur, India.
Document 15: Dr. Karni Singh Shooting Range: Dr. Karni Singh Shooting Range is a shooting range in New Delhi. Spread over 72 acres, it is situated on South Delhi ridges in the backdrop of Adilabad Fort, near the historic Tughlaqabad Fort to its North and Surajkund Lake to its South West. It was first constructed for the 1982 Asian Games in New Delhi, and later rebuild altogether for the 2010 Commonwealth Games. It was named after Dr. Karni Singh who won the silver medal at the 38th World Shooting Championships at Cairo in 1962 and was the first shooter to be awarded the Arjuna Award in 1961. The reconstruction work started on 25 October 2008 and the project was completed at a cost of Rs. 150 crore in 13 months. It was dedicated to the nation on 31 January 2010 by Union Minister for Youth Affairs & Sports.
ground_truth: 27 June 1964