Lactose intolerance is caused by a deficiency in the enzyme ________

The decision to summon a medical helicopter should be made early in _______ _______

Fill in the blank(s) with correct word

Regarding ambulance warning devices, which of the following statements is NOT true?

A) The use of strobes is controversial. B) The large lights on the outermost corners of the ambulance box should blink alternately. C) Four-way flashers should not be used as emergency lights. D) In most states it is illegal to drive at night with only one headlight.