In \triangle P Q R, S T \parallel R Q. Triangle P S T is similar to triangle P R Q with a shared vertex P. If P S = 12.5, S R = 5, and P T = 15, find T Q.
Choices:
A:5
B:6
C:6.5
D:12.5
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: In \triangle P Q R, S T \parallel R Q. Triangle P S T is similar to triangle P R Q with a shared vertex P. If P S = 12.5, S R = 5, and P T = 15, find T Q.
Choices:
A:5
B:6
C:6.5
D:12.5
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: In \triangle P Q R, S T \parallel R Q. Triangle P S T is similar to triangle P R Q with a shared vertex P. If P S = 12.5, S R = 5, and P T = 15, find T Q.
Choices:
A:5
B:6
C:6.5
D:12.5