The correct choice is (a) True
Easiest explanation: Ale strains and lager strains can be easily differentiated by incubating at the temperature 37-38°C. Ale strains have a maximum growth temperature of 37.5 to 39.8°C. whereas lager strains grow at 31.6 to 34.0°C. Thus, it is an easy method for differentiation of strains.