Final answer:
Option d) A leaked memo from one member of parliament to another is not an example of an official document.
Step-by-step explanation:
The correct answer is d) A leaked memo from one member of parliament to another. The other options are examples of official documents. Option a) is an official report of a public inquiry into a disaster, option b) is a collection of interview transcripts which can be used as evidence in research, and option c) is documentation from a pharmaceutical company which has official information about a new drug. However, a leaked memo is not an official document as it is not intended to be made public and is often unauthorized.