Incorrect Pair: c) lvanowsky - Discovered retroviruses

Explanation:
- The incorrect pair in the given options is c) lvanowsky - Discovered retroviruses.
- lvanowsky did not discover retroviruses. The discovery of retroviruses can be attributed to two scientists - Howard Temin and David Baltimore in the 1970s.
- Below, we will discuss the contributions of the other scientists mentioned in the options.

a) Louis Pasteur - Coined the term virus:
- Louis Pasteur was a French biologist and chemist who made significant contributions to the field of microbiology.
- Although Pasteur did not discover viruses, he made several important discoveries and advancements in the understanding of infectious diseases.
- He is known for his work on germ theory, which proposed that microorganisms are the cause of many diseases.
- Pasteur's experiments with silkworms led him to coin the term "virus" to describe the disease-causing agent that affected the silkworms.

b) Beijerinck - Contagium vivum fluidum:
- Martinus Beijerinck was a Dutch microbiologist who is often referred to as one of the founders of virology.
- Beijerinck made several important contributions to the field, including his concept of "contagium vivum fluidum," which translates to "contagious living fluid."
- He used this term to describe the agent responsible for the tobacco mosaic disease, which is now known to be a virus (Tobacco mosaic virus or TMV).
- Beijerinck's work on TMV demonstrated that the agent was smaller than bacteria and could pass through filters that retained bacteria.

d) Stanley - Crystallised TMV:
- Wendell Meredith Stanley was an American biochemist who won the Nobel Prize in Chemistry in 1946 for his work on the purification and crystallization of viruses.
- Stanley successfully crystallized the tobacco mosaic virus (TMV) in 1935, which marked a major breakthrough in the study of viruses.
- This achievement allowed for further characterization of the virus and led to a better understanding of its structure and properties.

Conclusion:
- In conclusion, the incorrect pair in the given options is c) lvanowsky - Discovered retroviruses.
- lvanowsky did not discover retroviruses. The discovery of retroviruses can be attributed to Howard Temin and David Baltimore.
- The other options correctly represent the contributions of the respective scientists mentioned.