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Thus, a person called to testify before Congress can refuse if they believe the government could use the testimony against them in criminal proceedings. To render the protections against self-incrimination ineffective, Congress can provide immunity from criminal prosecution.
You cannot refuse to testify or answer questions. If you do refuse, you may be held in contempt of court and fined, sentenced to prison, or both. It's important to remember, however, that your testimony cannot be used to incriminate you in other proceedings, except if you commit perjury or give contradictory testimony.