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As the probe into Joe Biden’s mental acuity continues, the former president’s personal physician, Kevin O’Connor, DO, made an appearance this week in Washington, D.C., in front of the House Oversight Committee.

O'Connor sat down for a closed-door interview on Wednesday with committee staff and panel chair James Comer, R-Ky. — but O'Connor invoked the Fifth Amendment to all questions, save for his name, as Fox News Digital previously reported.

In the wake of this, many people have been wondering: What's the difference between a doctor of osteopathic medicine (DO) and a doctor of medicine (MD)?

EX-WHITE HOUSE PHYSICIAN SLAMS BIDEN DOCTOR FOR SILENCE DURING HOUSE GOP GRILLING

Dr. Marc Siegel, Fox News' senior medical analys

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