Final answer:
The pharmaceutical company ran into the limitation of using outdated demographic data from the 2010 Census for their secondary research, which may not accurately reflect the current population of Phoenix, AZ.
Step-by-step explanation:
The known limitation that the pharmaceutical company ran into with their secondary research is that the demographic data they used was from the 2010 Census, which means it is outdated. Since their research is focused on the market conditions for their newest cold medicine, using old demographic data may not accurately reflect the current population of Phoenix, AZ. This can result in ineffective marketing efforts and a potential mismatch between their target market and the actual market.