The examination co-ordinator of NEST-2011 said "it is not true that some candidates of NEST-2011 neither attempted Mathematics nor attempted Physics". Then we deduce that

• Correct answer
  A

  all candidates attempted Mathematics or Physics.
• B

  all candidates attempted both Mathematics and Physics.
• C

  some candidates attempted both Mathematics and Physics.
• D

  some candidates attempted Mathematics or Physics.

Hence, the correct answer is option: 'A'.