question: When was the retired Indian track and field athlete coached by O. M. Nambiar born? 
answer: 27 June 1964
context: Title: K. M. Binu
  Passage: 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.
  Title: Santhi Soundarajan
  Passage: 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.
  Title: Angel Mary Joseph
  Passage: Angel Mary Joseph (born 24 September 1953) is a retired Indian track and field athlete.  She specialized in 100 metres hurdles, Long Jump, Pentathlon, and once held national records in all the three and high jump and heptathlon.  At the 1978 Asian Games in Tehran, she won silver medals in long jump and pentathlon.  She also represented Karnataka and Railways playing basketball in the National Championships.
  Title: P. T. Usha
  Passage: 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.
  Title: O. M. Nambiar
  Passage: 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.
citations: O. M. Nambiar P. T. Usha