The Avermectins Are a Very Commonly Used Class of Antiparasitics

question 14

Multiple Choice

The avermectins are a very commonly used class of antiparasitics. Why don't these drugs work well against some parasites, such as tapeworms?

• A)Tapeworms aren't parasites
• B)Tapeworms actively excrete these drugs once exposed
• C)Collies are selectively infested with tapeworms, but they are too sensitive to avermectins for use
• D)Tapeworms lack proper glutamate receptors

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