Charlie,
What do they say the correct answer is?
Nick,
Several helicopters can experience VRS at 35 knots. Helicopters with highly loaded rotors at gross weight and high altitude may experience VRS will above 35 knots. However, it won't be at 300 or even 500 feet ROD. For example, an CH-53E at gross weight and 10,000 feet can experience VRS up to 38 knots. The ROD however, would have to be between 3800 and 4800 fpm.