During cultivation of microorganisms in a fermenter, various parameters are controlled by appropriate sensor (probe). Match each probe in Group I with the appropriate response mechanism in Group II.
| Group I (Probe) | Group II (Response) |
| P. Thermistor | 1. Activation of acid/alkali pump |
| Q. Oxygen electrode | 2. Activation of vegetable oil pump |
| R. Metal rod | 3. Activation of hot/cold water pump |
| S. pH electrode | 4. Increase/decrease in stirrer motor speed |
A. P-2, Q-3, R-1, S-4
B. P-1, Q-2, R-4, S-3
C. P-3, Q-2, R-4, S-1
D. P-3, Q-4, R-2, S-1
Answer: Option D
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