The following are examples of essential amino acids EXCEPT

Correct Answer: C

Rationale: Essential amino acids must be dietary, as the body cannot synthesize them. 'Alanine,' is correct as the exception, a non-essential amino acid produced from pyruvate, per biochemistry (e.g., Nelson). 'Leucine,' 'Lysine,' and 'Valine,' are essential, required from food. Alanine's endogenous synthesis contrasts with the dietary need for others, making C the precise answer.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.