Options are:
[1]. resistance
[2]. lungs
[3]. nerves
[4]. Bend
[5]. triceps
[6]. strong
[7]. mechanical
[8]. four limbs
Q: Fact 1: Muscles can only contract. Fact 2: Arm day hits the bicep, tricep and forearm muscles. Given the two facts above, what can only contract?
A:
[5].