This question is asking us to pin down the year of the first human-to-human heart transplant, a landmark event in cardiac surgery performed by Dr. Christiaan Barnard at Groote Schuur Hospital in Cape Town, South Africa. Instead of recalling the date directly, we can rule out each option using what else we know about the medical and historical timeline around it.
Ruling out 1968, 1958 and 1922 on medical-history grounds leaves only one option standing.
Therefore, the correct answer is 1967.