law: Indian Evidence Act, 1872 
  20. Admissions by persons expressly referred to by party
  
  to suit
  Statements made by
  
  persons to whom party to the suit has expressly referred for information in
  
  reference to a matter in dispute are admissions.
  Illustration
  The question is,
  
  whether a horse sold by A to B is sound.
  A says to B- " Go
  
  and ask C, knows all about it" C’s statement is an admission.