Final answer:
The power to obtain information, summon, examine, and take testimony of persons is provided in Section 5 of the National Internal Revenue Code (NIRC), allowing the Bureau of Internal Revenue (BIR) in the Philippines to gather information and evidence during tax investigations and audits.
Step-by-step explanation:
The power to obtain information, summon, examine, and take testimony of persons is a provision of the Section 5 of the National Internal Revenue Code (NIRC). This power is typically exercised by the Bureau of Internal Revenue (BIR) in the Philippines. It allows the BIR to gather information and evidence, including through the examination of witnesses, during tax investigations and audits.