Which condition is needed for penicillin production in a fermenter?
- Aadding bubbles of nitrogen gas to mix the nutrients and $\textit{Penicillium}$
- Badding the required amount of sugar as a nutrient
- Censuring no oxygen enters the fermenter so only anaerobic respiration occurs
- Dmaintaining a constant temperature of $95\,^\circ\text{C}$ to prevent other microorganisms growing