Technician A says that the best way of confirming that a diesel engine is running clean is to observe the exhaust gas and if it ‘looks clean, it probably is clean'. Technician B says that white smoke emission is caused by liquid condensing in the exhaust gas. Who is correct?

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B


Answer: B

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