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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.
As a general rule, a court can force you to testify after sending you a subpoena informing you what testimony they need. The testimony includes self incriminating evidence: The constitution gives you the right to avoid giving self-incriminating evidence under the Fifth Amendment of the Constitution.