Refer to the input text as context and select the correct relationship between 'MedImmune' and 'AstraZeneca' from the available options.
Options: original broadcaster, manufacturer, parent organization, platform

Companies like Pfizer, Sanofi, Merck, AstraZeneca and MedImmune continue to disinfect with a safe SteraMist BIT chemical protecting their operator, facility and the environment, while providing the confidence to the American population that we will produce sterile vaccines.
parent organization