Section 4501. Self-incrimination

A competent witness shall not be excused
  from answering a relevant question, on the ground only that  the  answer
  may  tend  to establish that he owes a debt or is otherwise subject to a
  civil suit. This section does not require a witness to  give  an  answer
  which  will  tend  to  accuse  himself  of a crime or to expose him to a
  penalty or forfeiture, nor does it vary any other  rule  respecting  the
  examination of a witness.