What word does NOT make the "f" sound when pronouncing it?

O a. Physiology
O b. Ptosis
O c. Febrile
O d. Phase

The word "ptosis" does not make the "f" sound when pronouncing it. So, the correct answer is b. Ptosis.

The word that does not make the "f" sound when pronouncing it is "Ptosis."

To determine which word does NOT make the "f" sound when pronouncing it, we can break down the pronunciation of each word and focus on the specific sound in question.

a. Physiology: This word does not end with "f" and does not contain the "f" sound. It is pronounced as fi-zee-OL-uh-jee.

b. Ptosis: This word does not contain the letter "f" and does not make the "f" sound. It is pronounced as TOH-sis.

c. Febrile: This word does contain the letter "f," thus making the "f" sound. It is pronounced as FEE-brile.

d. Phase: This word does not contain the letter "f" and does not make the "f" sound. It is pronounced as fayz.

Therefore, the word that does NOT make the "f" sound when pronouncing it is "d. Phase."