Selection of every fifth patient from the list of tuberculosis patients admitted in a hospital is known as:

Correct option is A

Systematic random sampling is a probability sampling technique where researchers select every 'kth' individual from a list, after choosing a random starting point. In this case, selecting every fifth TB patient from the hospital list fits this method perfectly.
Explanation of options: (a) Systematic random sampling – ✔ Correct. Involves selecting every nth individual from a list, which matches the scenario exactly. (b) Simple random sampling – ❌ Every individual has an equal chance of being selected, but there’s no fixed interval involved. (c) Stratified random sampling – ❌ Involves dividing the population into subgroups (strata) and sampling from each, which is not the case here. (d) Sequential sampling – ❌ Involves evaluating subjects one after another, not selecting at fixed intervals.